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3.4: Practical Frameworks and Tools

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    Learning Objectives
    1. Understand the core premises of each framework or tool.
    2. Compare and contrast the frameworks and tools to evaluate the contributions of each to sustainability thinking.
    3. Apply the frameworks and tools to improve existing products and services or to create new ones.

    This section lists and discusses a set of frameworks and tools available to business decision makers. Those who are starting companies or those inside established firms can draw from these ideas and conduct further research into any tool that is of particular interest. Our purpose is to educate the reader about the variety and content of tools being applied by firms that are active in the sustainability innovation space. Each tool is somewhat different in its substance and applicability. The following discussion moves from the most general to the most specific. For example, The Natural Step (TNS) is a broad framework used by firms, municipalities, and nonprofit organizations, whereas industrial ecology is an academic field that has provided overarching concepts as well as developed product design tools. Natural capitalism is a framework developed by well-known energy and systems expert Amory Lovins together with L. Hunter Lovins and author-consultant Paul Hawken. Ecological economics is a branch of economics that combines analysis of environmental systems with economic systems, while cradle-to-cradle is a design protocol with conceptual roots in the field of industrial ecology. Nature’s services refers to the ability of natural systems to ameliorate human waste impacts, and the related concept of ecosystem service markets references the burgeoning arena of markets for the services natural systems provide to business and society. The biomimicry approach calls for greater appreciation of nature’s design models as the inspiration for human-designed technology. Green chemistry is a fast-expanding challenge to the conventional field of chemistry. It invites use of a set of twelve principles for the design of chemical compounds. Green engineering offers guiding design parameters for sustainability applied to engineering education. Life-cycle analysis, design for environment, concurrent engineering, and carbon footprint analysis are tools for analysis and decision making at various levels of business activity including within the firm and extending to supply chains. There is no “right” framework or tool. It depends on the specific task at hand. Furthermore, some of these tools share common assumptions and may overlap. However, this is a useful sample of the types of frameworks and tools in use. Reviewing the list provides the reader with insights into the nature and direction of sustainability innovation and entrepreneurship.

    The Natural Step

    TNS is both a framework for understanding ecological principles and environmental problems and an international nonprofit education, consultation, and research institution based in Sweden. TNS was founded in 1989 by Swedish pediatric oncologist Dr. Karl-Henrik Robèrt. In his medical practice, Dr. Robèrt observed an increase of rare cancers in children who were too young to have their cells damaged through lifestyle choices. He began to explore human-caused pollution (environmental) causes—outcomes of industrial and commercial activity. Once engaged in the process and frustrated by the polarized public and scientific debates over pollution, Dr. Robèrt began enlisting leading Swedish scientists to identify irrefutable principles from which productive debate could follow. These principles became the basis for TNS framework now used by many businesses worldwide to guide strategy and product design.Andrea Larson and Wendy Warren, The Natural Step, UVA–G–0507 (Charlottesville: Darden Business Publishing, University of Virginia, 1997), 1–3.

    The principles the scientists distinguished during the consensus-building process are three well-known and very basic physical laws. The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only changed in form. Whether electrical, chemical, kinetic, heat, or light, the total energy remains constant. Similarly, the law of conservation of matter tells us that the total amount of matter is constant and cannot be created or destroyed.These two laws assume that matter and energy are not being converted into each other through nuclear processes, but when fission and fusion are taken into account, mass-energy becomes the new conserved quantity. Finally, by the second law of thermodynamics, we know that matter and energy tend to disperse. Greater entropy, or disorder, is the inevitable outcome. Think about the decomposition of discarded items. Over time, they lose their structure, order, and concentration; in other words, they lose their quality.

    In our biosphere, these laws imply things do not appear or disappear; they only take on different forms. All energy and matter remain, either captured temporarily in products or dispersed into the air, water, and soil. The matter humans introduce into the biosphere from the earth’s crust (e.g., by mining and drilling) or from corporate research laboratories (synthetic compounds) eventually is released and dispersed into the larger natural systems, including the air we breathe, water we drink, and food we eat. Furthermore, humans do not literally “consume” products. We only consume or use up their quality, their purity, and their manufactured temporary structure. Thus there is no “away” when we throw things away.

    However, if the law of entropy dictates that matter and energy tend toward disorder rather than toward complex materials and ecosystems, what keeps the earth’s systems running? An outside energy input is needed to create order. That energy is the sun. While the earth is essentially a closed system with respect to matter, it is an open system with respect to energy. Hence net increases in material quality on Earth ultimately derive from solar energy, present or ancient.Karl-Henrik Robèrt, Herman Daly, Paul Hawken, and John Holmberg, “A Compass for Sustainable Development,” Natural Step News 1 (Winter 1996): 4.

    Green plant cells, as loci of photosynthesis, curb entropy by using sunlight to generate order. The cells produce more structure, quality, and order than they destroy through dissipation. Plants thereby regulate the biosphere by capturing carbon dioxide (CO2), producing oxygen for animal life, and creating food. Fossil fuels, meanwhile, are simply that: the end products of photosynthesis in fossil form.

    The Natural Step for Business

    To summarize, while the Earth is a closed system with regard to matter, it is an open system with respect to energy. This is the reason why the system hasn’t already run down with all of its resources being converted to waste. The Earth receives light from the sun and emits heat into space. The difference between these two forms of energy creates the physical conditions for order in the biosphere—the thin surface layer in the path of the sun’s energy flow, in which all of the necessary ingredients for life as we know it are mingled.Brian Nattrass and Mary Altomare, The Natural Step for Business (Gabriola Island, BC: New Society Publishers, 1999), 35.

    Cyclical systems lie at the heart of TNS framework. While the natural world operates in a continuously regenerative cyclical process—photosynthesis produces oxygen and absorbs CO2; plants are consumed, die, and decay, becoming food for microbial life; and the cycle continues—humankind has typically used resources in a linear fashion, producing waste streams both visible and molecular (invisible) that cannot all be absorbed and reassimilated by nature, at least not within time frames relevant for preservation of human health and extension of prosperity to billions more who demand a better life. The result is increasing accumulations of pollution and waste coupled with a declining stock of natural resources.Andrea Larson and Joel Reichert, IKEA and the Natural Step, UVA-G-0501 (Washington, DC: World Resources Institute and Darden Graduate School of Business Administration, 1998), 18. In the case of oil, global society must address both declining resources and control of existing resources by either unstable governments or regimes whose aims can oppose their own populations’ and other countries’ well-being.

    TNS System Conditions

    With foundational scientific principles dictating a compelling logic that guides decision making, a framework of system conditions followed to form TNS system conditions:

    1. The first system condition states that “substances from the earth’s crust must not systematically increase in the ecosphere.” This means that the rate of extraction of fossil fuels, metals, and other minerals must not exceed the pace of their slow redeposit and reintegration into the earth’s crust. The phrase “systematically increase” in the systems conditions deserves elaboration. The natural system complexity that has built and sustains the biosphere maintains systemic equilibrium within a certain range. We now recognize that humans contribute to CO2 atmospheric buildup, potentially tipping climate to a new equilibrium to which we must adapt.
    2. The second system condition requires that “substances produced by society must not systematically increase in the ecosphere.” These substances, synthetic compounds created in laboratories, must be produced, used, and released at a rate that does not exceed the rate with which they can be broken down and integrated into natural cycles or safely incorporated in the earth’s crust (soil, water).
    3. The third condition states that “the physical basis for productivity and diversity of nature must not be systematically diminished.” This requirement protects the productive capacity and diversity of the earth’s ecosystems as well as the green plant cells, the photosynthesizers on which the larger ecological systems depend.
    4. Finally, the fourth system condition, a consideration of justice, calls for the “fair and efficient use of resources with respect to meeting human needs.”

    Under TNS framework, these four system conditions act as a compass that can guide companies, governments, nonprofit organizations, and even individuals toward sustainability practices and innovation.Karl-Henrik Robèrt, Herman Daly, Paul Hawken, and John Holmberg, “A Compass for Sustainable Development,” Natural Step News 1 (Winter 1996): 4–5. Here, “sustainability” explicitly refers to a carrying capacity or ability of natural systems to continue the age-old regenerative processes that have maintained the requisite chemistry and systems balance to support life as we know it.

    Figure \(\PageIndex{1}\): TNS System Conditions. Source: Green Business Ratings, “How We Avoid the Climate Change Confusion: We Follow the Principles of ‘The Natural Step,’” 2008, accessed March 16, 2011,

    TNS framework has been applied in many corporations and is seen by some as a logical extension of quality management and strategic systems thinking.Andrea Larson and Wendy Warren, The Natural Step, UVA–G–0507 (Charlottesville: Darden Business Publishing, University of Virginia, 1997), 2. It incorporates environmental and health protection into decision making by using scientific principles. TNS allows a company to understand the physical laws that drive environmental problems and defines the broad system conditions that form a “sustainable” society. These conditions provide a vehicle to assess progress, and from them companies can develop a strategy applicable to their products and services. Design teams can ask whether particular product designs, materials selection, and manufacturing processes meet each of the system conditions and can adjust in “natural steps”—that is, steps that are consistent with financially sound decision making in the direction of meeting the system conditions. TNS does not provide a detailed how-to regarding specific product design; however, with the knowledge and framework provided by TNS, companies can develop a more informed approach and strategic position and begin to take concrete steps customized to their unique circumstance with respect to natural resource use and waste streams.

    The Natural Step as an Institution

    To learn more about The Natural Step as a framework or institution, go to

    Industrial Ecology

    Business activity currently generates waste and by-products. Unlike natural systems, modern human societies process resources in a linear fashion, creating waste faster than it can be reconstituted into reusable resources. According to the National Academy of Engineering, on average 94 percent of raw materials used in a product ends up as waste; only 6 percent ends up in the final product. Whereas pollution control and prevention focus on minimizing waste, industrial ecology allows for inevitable waste streams since they become useful inputs to other industrial and commercial processes. Continued provision of needed goods and services to growing populations in a finite biosphere becomes at least conceptually possible if all waste generated by business and consumer behavior is taken up by other industrial and commercial processes or safely returned to nature.

    Figure \(\PageIndex{2}\): Waste Dominates Production

    Consequently, the field of industrial ecology assumes the industrial system exists as a human-produced ecosystem with distinct material, energy, and information flows similar to any other ecosystem within the biosphere. It therefore must meet the same physical constraints as other ecosystems to survive. As a systems approach to understanding the interaction between industry and the natural world, industrial ecology looks beyond the linear cradle-to-grave viewpoint of design—you source materials, build the product, use the product, and throw it away—and imagines business as a series of energy and material flows in which ideally the wastes of one process serve as the feedstock of another. Accordingly, nature’s processes and business activities are seen as interacting systems rather than separate components. They form an industrial web analogous to but separate from the natural web from which they may nonetheless draw inspiration.Hardin B. C. Tibbs, “Industrial Ecology: An Environmental Agenda for Industry,” Whole Earth Review 4, no. 16 (Winter 1992): 4–19; Deanna J. Richards, Braden Allenby, and Robert A. Frosch, “The Greening of Industrial Ecosystems: Overview and Perspective,” in The Greening of Industrial Ecosystems, ed. Deanna J. Richards and Braden Allenby (Washington, DC: National Academy Press, 1994), 3.

    Clinton Andrews, a professor of environmental and urban planning, suggested a series of themes for industrial ecology based on natural metaphors: “Nutrients and wastes become raw materials for other processes, and the system runs almost entirely on solar energy. The analogy suggests that a sustainable industrial system would be one in which nearly complete recycling of materials is achieved.” Andrews described the present industrial systems as having “primitive metabolisms,” which will be “forced by environmental and social constraints to evolve more sophisticated metabolisms.…Inexhaustibility, recycling, and robustness are central themes in the industrial ecology agenda.”Clinton Andrews, Frans Berkhout, and Valerie Thomas, “The Industrial Ecology Agenda,” in Industrial Ecology and Global Change, ed. Robert Socolow, Clinton Andrews, Frans Berkhout, and Valerie Thomas (Cambridge: Cambridge University Press, 1994), 471–72. Theoretically, restructuring industry for compatibility with natural ecosystems’ self-regulation and self-renewal would reduce the current human activity that undermines natural systems and creates the growing environmental health problems we face.

    In 1977, American geochemist Preston Cloud observed that “materials and energy are the interdependent feedstocks of economic systems, and thermodynamics is their moderator.”Suren Erkman, “Industrial Ecology: An Historical View,” Journal of Cleaner Production 5, no. 1–2 (1997): 1–10. Cloud’s point about thermodynamics anticipates TNS, and he was perhaps the first person to use the term “industrial ecosystem.”Preston Cloud, “Entropy, Materials and Posterity,” Geologische Rundschau 66, no. 3 (1977): 678–96, quoted and cited in John Ehrenfeld and Nicholas Gertler, “Industrial Ecology in Practice: The Evolution of Interdependence at Kalundborg,” Journal of Industrial Ecology 1, no. 1 (Winter 1997): 67–79. Despite earlier analogies between the human economy and natural systems, this correspondence did not gain widespread currency until 1989 when business executive Robert Frosch and Nicholas Gallopoulos first coined the term “industrial ecology”Robert A. Frosch and Nicholas E. Gallopoulos, “Strategies for Manufacturing,” Scientific American 261, no. 3 (September 1989): 144–52. and described it in Scientific American as follows:

    In nature an ecological system operates through a web of connections in which organisms live and consume each other and each other’s waste. The system has evolved so that the characteristic of communities of living organisms seems to be that nothing that contains available energy or useful material will be lost. There will evolve some organism that will manage to make its living by dealing with any waste product that provides available energy or usable material. Ecologists talk of a food web: an interconnection of uses of both organisms and their wastes. In the industrial context we may think of this as being use of products and waste products. The system structure of a natural ecology and the structure of an industrial system, or an economic system, are extremely similar.Robert A. Frosch, “Industrial Ecology: A Philosophical Introduction,” Proceedings of the National Academy of Sciences, USA, vol. 89 (February 1992): 800–803.

    Professor Robert U. Ayres clarified process flows within the natural and industrial systems by naming them the “biological metabolism” and the “industrial metabolism.”Ayres coined the term “industrial metabolism” at a conference at the United Nations University in 1987. The proceedings of this conference were published in Robert U. Ayres and Udo Ernst Simonis, eds., Industrial Metabolism (Tokyo: United Nations University Press, 1994). The feedstocks of these systems are known as “biological nutrients” and “industrial nutrients,” respectively, when they act in a closed cycle (which is always the case in nature, and rarely the case in industry).See Robert U. Ayres, “Industrial Metabolism: Theory and Practice,” in The Greening of Industrial Ecosystems, ed. Deanna J. Richards and Braden Allenby (Washington, DC: National Academy Press, 1994), 25; Robert U. Ayres and Udo Ernst Simonis, eds., Industrial Metabolism (Tokyo: United Nations University Press, 1994). In an ideal industrial ecosystem, there would be, as Hardin Tibbs wrote, “no such thing as ‘waste’ in the sense of something that cannot be absorbed constructively somewhere else in the system.” This suggests that “the key to creating industrial ecosystems is to reconceptualize wastes as products.”Hardin B. C. Tibbs, “Industrial Ecology: An Environmental Agenda for Industry,” Whole Earth Review 4, no. 16 (Winter 1992): 4–19.

    Others have pointed out that “materials and material products (unlike pure services) are not really consumed. The only thing consumed is their ‘utility.’”Robert U. Ayres and Allen V. Kneese, “Externalities: Economics and Thermodynamics,” in Economy and Ecology: Towards Sustainable Development, ed. Franco Archibugi and Peter Nijkamp (Dordrecht, Netherlands: Kluwer Academic Publishers, 1989), 90. This concept has led to selling the utilization of products rather than the products themselves, thus creating a closed-loop product cycle in which manufacturers maintain ownership of the product. For example, a company could lease the service of floor coverings rather than sell carpeting. The responsibility for creating a system of product reuse, reconditioning, and other forms of product life extension, or waste disposal, then falls on the owner of the product—the manufacturer—not the user.Walter R. Stahel, “The Utilization-Focused Service Economy: Resource Efficiency and Product-Life Extension,” in The Greening of Industrial Ecosystems, ed. Deanna J. Richards and Braden Allenby (Washington, DC: National Academy Press, 1994), 183. This product life cycle can be described as being “from cradle back to cradle,” rather than from cradle to grave, which is of primary importance in establishing a well-functioning industrial ecosystem.Walter R. Stahel, “The Utilization-Focused Service Economy: Resource Efficiency and Product-Life Extension,” in The Greening of Industrial Ecosystems, ed. Deanna J. Richards and Braden Allenby (Washington, DC: National Academy Press, 1994), 183. The cradle-to-cradle life cycle became so important to some practitioners that it emerged as an independent concern.

    The challenges to establishing a sophisticated industrial ecosystem are many, including identifying appropriate input opportunities for waste products amid ownership, geographic, jurisdictional, informational, operational, regulatory, and economic hurdles. Although industrial ecology could theoretically link industries around the globe, it has also been used at a local scale to mitigate some of these challenges. Several eco-industrial parks are currently in development (Kallundborg, Denmark, is the well-known historical example) where industries are intentionally sited together based on their waste products and input material requirements. If the interdependent system components at the site are functioning properly, the emissions from the industrial park are zero or almost zero. Problems arise when companies change processes, move facilities, or go out of business. This disrupts the ordered and tightly coupled chain of interdependency, much as when a species disappears from a natural ecosystem. Industrial ecology thus provides a broad framework and suggests practical solutions.

    Natural Capitalism

    Natural capitalism is a broad social and economic framework that attempts to integrate insights from eco-efficiency, nature’s services, biomimicry, and other realms to create a plan for a sustainable, more equitable, and productive world. Paul Hawken, author of The Ecology of Commerce, and Amory Lovins and L. Hunter Lovins, cofounders of the Rocky Mountain Institute for resource analysis and coauthors with Ernest von Weizsäcker of Factor Four: Doubling Wealth, Halving Resource Use, were independently looking for an overall framework to implement the environmental business gains they had studied and advocated. After learning of each other’s projects, they decided in 1994 to collaborate on Natural Capitalism:

    Some very simple changes to the way we run our businesses, built on advanced techniques for making resources more productive, can yield startling benefits both for today’s shareholders and for future generations. This approach is called natural capitalism because it’s what capitalism might become if its largest category of capital—the “natural capital” of ecosystem services—were properly valued. The journey to natural capitalism involves four major shifts in business practices, all vitally interlinked:

    • Dramatically increase the productivity of natural resources.…
    • Shift to biologically inspired production models.…
    • Move to a solution-based business model.…
    • Reinvest in natural capital.…Amory Lovins, L. Hunter Lovins, and Paul Hawken, “A Road Map for Natural Capitalism,” Harvard Business Review 77, no. 3 (May–June 1999): 146–48.
    The Big Picture of Interdependence

    In all respects, Natural Capitalism is about integration and restoration, a systems view of our society and its relationships to the environment. Paul Hawken, Amory Lovins, and L. Hunter Lovins, Natural Capitalism: Creating the Next Industrial Revolution (Boston: Little, Brown, 1999), xii–xiii.

    Natural capitalism emphasizes a broad and integrated approach to sustainable human activity. Although economic, environmental, and social goals had been conventionally seen in conflict, natural capitalism argues, “The best solutions are based not on tradeoffs or ‘balance’ between these objectives but on design integration achieving all of them together.”Paul Hawken, Amory Lovins, and L. Hunter Lovins, Natural Capitalism: Creating the Next Industrial Revolution (Boston: Little, Brown, 1999), xi. Hence, by considering all facets of the problem in advance, business can yield dramatic, multiple improvements and will drive environmental progress. For perhaps the simplest example, using more sunlight and less artificial light in buildings lowers energy costs, reduces pollution, and improves workers’ outlook and satisfaction, and hence their productivity and retention rates.

    Like similar broad frameworks for sustainability, natural capitalism perceives a variety of current structures, rather than lack of knowledge or opportunity for profit, as obstacles to progress: perverse incentives from government tax policy hamper change, the division of labor and capital investments among different groups does not reward efficiency for the entire system but only the cheapest choice for each individual, companies do not know how to value natural capital properly, and so on.

    Moving Away from Fossil Fuels

    Amory Lovins talks about weaning the US economy off oil, 2005 Technology, Entertainment, and Design (TED) Conference.

    Lovins argues that interlocking government incentives, rewards, market forces, and other system-level considerations can easily create the conditions to reduce US oil use.

    Natural capitalism also criticizes eco-efficiency as too narrow: “Eco-efficiency, an increasingly popular concept used by business to describe incremental improvements in materials use and environmental impact, is only one small part of a richer and more complex web of ideas and solutions.…More efficient production by itself could become not the servant but the enemy of a durable economy.”Paul Hawken, Amory Lovins, and L. Hunter Lovins, Natural Capitalism: Creating the Next Industrial Revolution (Boston: Little, Brown, 1999), xi–xii.

    Natural capitalism does, however, see eco-efficiency as one important component of curbing environmental degradation. Adapting the best-available technology and designing entire systems, rather than just pieces, to function efficiently from the outset saves money quickly. That money can be invested in other changes. Indeed, natural capitalism’s case studies argue major gains in productivity by reconceiving entire systems are often cheaper than minor gains from incremental improvements.

    Figure \(\PageIndex{3}\): Value of Forests. Source: UNEP/GRID-Arendal, “Annual flow of benefits from forests in selected countries,” UNEP/GRID-Arendal Maps and Graphics Library, accessed January 4, 2011,

    Natural capitalism’s three other principles emphasize eliminating waste entirely and uniting environmental and economic gains. For instance, mimicking natural production systems means waste from one process equals food for another in a closed loop. Shifting from providing goods to providing services holds manufacturers accountable for their products and allows them to benefit from their design innovations while eliminating the waste inherent in planned obsolescence. Finally, companies can reinvest in natural capital to replenish, sustain, and expand the services and goods ecosystems provide. Beyond mimicry, letting nature do the work in the first place means that benign, efficient processes, such as using wetlands to process sewage, can replace artificial and often more dangerous and energy-intensive practices.

    For example, a study of forests around the Mediterranean suggested that preserving forests may provide greater economic value than consuming those forests for timber and grazing land. Forests contribute immensely to clean waterways by limiting erosion and filtering pollutants. They can also sequester CO2, provide habitats for other valuable plants and animals, and encourage recreation and tourism. Investing in forests could therefore return dividends in various ways.

    Ecological Economics

    Ecological economics as a field of study was formalized in 1989 with the foundation of the International Society for Ecological Economics (ISEE) and the first publication of the journal Ecological Economics. The move toward ecological economics had roots in the classical economics, natural sciences, and sociology of the mid-nineteenth century but gained significant momentum in the 1970sJuan Martinez-Alier with Klaus Schlüpmann, Ecological Economics: Energy, Environment and Society (Oxford: Basil Blackwell, 1987). as the strain between human activity (economics) and natural systems (ecology) intensified but no discipline or even group of disciplines examined the interaction of those two systems specifically. Robert Costanza commented on the problem and the need for a new approach: “Environmental and resource economics, as it is currently practiced, covers only the application of neoclassical economics to environmental and resource problems. Ecology, as it is currently practiced, sometimes deals with human impacts on ecosystems, but the more common tendency is to stick to ‘natural’ systems.…[Ecological economics] is intended to be a new approach to both ecology and economics that recognizes the need to make economics more cognizant of ecological impacts and dependencies; the need to make ecology more sensitive to economic forces, incentives, and constraints.”Robert Costanza, “What Is Ecological Economics?,” Ecological Economics 1 (1989): 1.

    The 2 × 2 diagram in Figure 3.5 depicts how ecological economics embraces a wide array of disciplines and interactions among them. For instance, conventional economics examines only transactions within economic sectors, while conventional ecology examines only transactions within ecological sectors. Other specialties arose to examine inputs from ecosystems to the economy (resource economics) or from the economic system to the environment (environmental economics and impact analyses). Ecological economics encompasses all possible flows among economies and ecosystems.

    Figure \(\PageIndex{4}\): The Interaction of Economics and Ecology. Source: Robert Costanza et al., “An Introduction to Ecological Economics: Chapter 2,” The Encyclopedia of Earth, September 21, 2007, accessed March 14, 2011,

    Ecological economics examines how economies influence ecologies and vice versa. It sees economic activity as occurring only within the confines of Earth’s processes for maintaining life and equilibrium and ecology as overwhelmingly influenced by humans, even if they are but one species among many. In short, the global economy is a subset of Earth systems, not a distinct, unfettered entity. Earth’s processes and resultant equilibrium are threatened by massive material extraction from and waste disposal into the environment, while material inequality among societies and people threatens long-term prosperity and social stability. Hence the constitution of the ISEE propounds the “advancement of our understanding of the relationships among ecological, social, and economic systems and the application of this understanding to the mutual well-being of nature and people, especially that of the most vulnerable including future generations.”International Society for Ecological Economics, “Constitution: Article II. Purpose,” accessed December 1, 2010, The field continues to emphasize broadly and rigorously investigating interdependent systems and their material and energy flows.

    Indeed, ecological economics began as a transdisciplinary venture. That variety in academic disciplines is reflected in the field’s seminal figures: Robert Costanza earned a master’s degree in urban and regional planning and a doctorate in systems ecology, Paul Ehrlich was a lepidopterist, Herman Daly was a World Bank economist, and Richard Norgaard an academic one. Diversity and breadth were enshrined in the ISEE constitution because “in an interconnected evolving world, reductionist science has pushed out the envelope of knowledge in many different directions, but it has left us bereft of ideas as to how to formulate and solve problems that stem from the interactions between humans and the natural world.”International Society for Ecological Economics, “Constitution: Article II. Purpose,” accessed December 1, 2010, Hence ecological economics has studied an array of issues, frequently including equitable economic development in poorer countries and questions of sustainable scale within closed systems.

    Ecological Economics for Policy

    Robert Costanza, Joshua Farley, and Jon Erickson discuss policy tools derived from ecological economic principles.

    Nonetheless, there has been some discussion of whether ecological economics should remain an eclectic category or become a defined specialty with concomitant methodologies.Richard B. Norgaard, “Ecological Economics: A Short Description,” Forum on Religion and Ecology, Yale University, 2000, accessed June 25, 2009, Ecological economics tends to use different models than mainstream economics and has a normative inclination toward sustainability and justice over individual preference or maximizing return on investments.Mick Common and Sigrid Stagl, Ecological Economics: An Introduction (Cambridge: Cambridge University Press, 2005), 10; Paul Ehrlich, “The Limits to Substitution: Meta-Resource Depletion and a New Economic-Ecological Paradigm,” Ecological Economics 1 (1989): 11. Moreover, while mainstream economics continues not to require an environmental education for a degree, some doctoral programs now grant a separate degree in ecological economics, while others offer it as a field for specialization. The location of ecological economics courses within university economics departments, however, suggests that contrary to the founding aspirations of the field, ecological economics has become the purview of economists more than ecologists in the United States.


    Cradle-to-cradle is a design philosophy articulated in the book of the same name by William McDonough and Michael Braungart in 2002.William McDonough and Michael Braungart, Cradle to Cradle: Remaking the Way We Make Things (New York: North Point Press, 2002). As of 2005, cradle-to-cradle is also a certification system for products tested by McDonough Braungart Design Chemistry (MBDC) to meet cradle-to-cradle principles. The basic premise of cradle-to-cradle is that for most of industrial history, we have failed to plan for the safe reuse of materials or their reintegration into the environment. This failure, born of ignorance rather than malevolence, wastes the value of processed goods, such as purified metals or synthesized plastics, and threatens human and environmental health. Hence McDonough and Braungart propose “a radically different approach for designing and producing the objects we use and enjoy…founded on nature’s surprisingly effective design principles, on human creativity and prosperity, and on respect, fair play, and good will.”William McDonough and Michael Braungart, Cradle to Cradle: Remaking the Way We Make Things (New York: North Point Press, 2002), 6.

    Consider the Ants

    Consider this: all the ants on the planet, taken together, have a biomass greater than that of humans. Ants have been incredibly industrious for millions of years. Yet their productiveness nourishes plants, animals, and soil. Human industry has been in full swing for little over a century, yet it has brought about a decline in almost every ecosystem on the planet. Nature doesn’t have a design problem. People do.William McDonough and Michael Braungart, Cradle to Cradle: Remaking the Way We Make Things (New York: North Pont Press, 2002), 16.

    In this approach, ecology, economy, and equity occupy equally important vertices of a triangle of human activity, and waste is eliminated as a concept in advance, as all products should be designed to become harmless feedstocks or “nutrients” for other biological or industrial processes. These closed loops acknowledge matter is finite on Earth, Earth is ultimately humanity’s only home, and the only new energy comes from the sun. Cradle-to-cradle thus shares and elaborates some of the basic understandings of TNS and industrial ecology albeit with an emphasis on product design and life cycle.

    McDonough is an architect who was inspired by elegant solutions to resource scarcity that he observed in Japan and Jordan. In the United States, he was frustrated by the dearth of options for improving indoor air quality in buildings in the 1980s. He also was frustrated with eco-efficiency’s “failure of imagination,” although eco-efficiency was a trendsetting business approach at the time. Eco-efficiency stressed doing “less bad” but still accepted the proposition that industry would harm the environment; hence, eco-efficiency would, at best, merely delay the worst consequences or, at worst, accelerate them. Furthermore, it implied economic activity was intrinsically negative. McDonough specified his personal frustration: “I was tired of working hard to be less bad. I wanted to be involved in making buildings, even products, with completely positive intentions.”William McDonough and Michael Braungart, Cradle to Cradle: Remaking the Way We Make Things (New York: North Point Press, 2002), 10.

    Cradle-to-Cradle Design

    William McDonough talks about cradle-to-cradle design at the 2005 TED conference.

    Braungart, meanwhile, was a German chemist active in the Green Party and with Greenpeace: “I soon realized that protest wasn’t enough. We needed to develop a process for change.”William McDonough and Michael Braungart, Cradle to Cradle: Remaking the Way We Make Things (New York: North Point Press, 2002), 11. He created the Environmental Protection Encouragement Agency (EPEA) in Hamburg, Germany, to promote change but found few chemists had any concern for environmental design, while industrialists and environmentalists mutually demonized each other.

    After Braungart and McDonough met in 1991, they drafted cradle-to-cradle principles and founded MBDC in 1994 to help enact them. One of their early successes was redesigning the manufacture of carpets for Swiss Rohner Textil AG. The use of recycled plastics in manufacturing carpet was rejected, as the plastic itself is hazardous; humans inhale or ingest plastics as they are abraded and otherwise degraded. Hence McDonough and Braungart designed a product safe enough to eat. They used natural fibers and a process that made effluent from the factory cleaner than the incoming water. This redesign exemplified McDonough and Braungart’s idea of “eco-effectiveness,” in which “the key is not to make human industries and systems smaller, as efficiency advocates propound, but to design them to get bigger and better in a way that replenishes, restores, and nourishes the rest of the world” and that returns humans to a positive “dynamic interdependence” with rather than dominance over nature.William McDonough and Michael Braungart, Cradle to Cradle: Remaking the Way We Make Things (New York: North Point Press, 2002), 78, 80.

    Figure \(\PageIndex{5}\): Products Cycle through the Biosphere and Technosphere. Source: EPEA, “Nutrient Cycles,” accessed March 16, 2011,

    McDonough and Braungart’s efforts proved that cradle-to-cradle design was possible, concretely illustrating concepts important to cradle-to-cradle design while affirming the prior decades of conceptual work. The first concept of eco-effectiveness or ecological intelligence to be realized in cradle-to-cradle was the sense of nature and industry as metabolic systems, fed by “biological nutrients” in the “biosphere” and “technical nutrients” in the “technosphere,” or industry. “With the right design, all of the products and materials of industry will feed these two metabolisms, providing nourishment for something new,” thereby eliminating waste.William McDonough and Michael Braungart, Cradle to Cradle: Remaking the Way We Make Things (New York: North Point Press, 2002), 104.

    McDonough and Braungart operationalized and popularized the concept of “waste equals food,” and by that phrase they mean that the waste of one system or process must be the “food” or feedstock of another. They were drawing on the industrial ecology writing of Robert Ayres, Hardin Tibbs, and others, since in a closed loop the waste is a nutrient (and an asset) rather than a problem for disposal. Hence waste equals food.Paul Hawken, Amory Lovins, and L. Hunter Lovins, Natural Capitalism: Creating the Next Industrial Revolution (Boston: Little, Brown, 1999), 12. Also see Paul Hawken and William McDonough, “Seven Steps to Doing Good Business,” Inc., November 1993, 81; William McDonough Architects, The Hannover Principles: Design for Sustainability (Charlottesville, VA: William McDonough Architects, 1992), 7. A core goal of sustainable design is to eliminate the concept of waste so that all products nourish a metabolism. Although lowering resource consumption has its own returns to the system, the waste-equals-food notion allows the possibility for nontoxic “waste” to be produced without guilt as long as the waste feeds another product or process.

    To explain further the implications of designing into the two metabolisms, McDonough and Braungart and Justus Englefried of the EPEA developed the Intelligent Product System, which is a typology of three fundamental products that guides design to meet the waste-equals-food test. The product types are consumables, products of service, and unsalables.Paul Hawken, Amory Lovins, and L. Hunter Lovins, Natural Capitalism: Creating the Next Industrial Revolution (Boston: Little, Brown, 1999), 67; William McDonough, “A Boat for Thoreau: A Discourse on Ecology, Ethics, and the Making of Things,” in The Business of Consumption: Environmental Ethics and the Global Economy, ed. Laura Westra and Patricia H. Werhane (Lanham, MD: Rowman and Littlefield, 1998), 297–317.

    A “consumable” is a product that is intended to be literally consumed, such as food, or designed to safely return to the biological (or organic) metabolism where it becomes a nutrient for other living things.Paul Hawken and William McDonough, “Seven Steps to Doing Good Business,” Inc., November 1993, 81. McDonough added that “the things we design to go into the organic metabolism should not contain mutagens, carcinogens, heavy metals, persistent toxins, bio-accumulative substances or endocrine disrupters.”William McDonough, “A Boat for Thoreau: A Discourse on Ecology, Ethics, and the Making of Things,” in The Business of Consumption: Environmental Ethics and the Global Economy, ed. Laura Westra and Patricia H. Werhane (Lanham, MD: Rowman and Littlefield, 1998), 297–317. For an explanation of endocrine disrupters, see Theo Colburn, Dianne Dumanoski, and John Peterson Myers, Our Stolen Future (New York: Dutton, 1996).

    A “product of service,” on the other hand, provides a service, as suggested by Walter Stahel and Max Börlin, among others.Walter R. Stahel, “The Utilization-Focused Service Economy: Resource Efficiency and Product-Life Extension,” in The Greening of Industrial Ecosystems, ed. Deanna J. Richards and Braden Allenby (Washington, DC: National Academy Press, 1994), 183; Robert U. Ayres and Allen V. Kneese, “Externalities: Economics and Thermodynamics,” in Economy and Ecology: Towards Sustainable Development, ed. Franco Archibugi and Peter Nijkamp (Dordrecht, Netherlands: Kluwer Academic Publishers, 1989), 90. Examples of service products include television sets (which provide the service of news and entertainment), washing machines (which provide clean clothes), computers, automobiles, and so on. These products would be leased, not sold, to a customer, and when the customer no longer required the service of the product or wanted to upgrade the service, the item would be returned to the producer to serve as a nutrient to the industrial metabolism. This system of design and policy provides an incentive for the producer to use design for environment (DfE) and concurrent engineering to design for refurbishing, disassembly, remanufacture, and so forth. Braungart suggests that “waste supermarkets” could provide centralized locations for customer “de-shopping,” where used service products are returned and sorted for reclamation by the producer.Paul Hawken and William McDonough, “Seven Steps to Doing Good Business,” Inc., November 1993, 81; Michael Braungart, “Product Life-Cycle Management to Replace Waste Management,” Industrial Ecology and Global Change, ed. Robert Socolow, Clinton Andrews, Frans Berkhout, and Valerie Thomas (Cambridge: Cambridge University Press, 1994), 335–37.

    An “unsalable,” also known as an “unmarketable,” is a product that does not feed metabolism in either the technosphere or the biosphere and thus should not be made. Unsalables include products that incorporate dangerous (radioactive, toxic, carcinogenic, etc.) materials or that combine both biological and technical nutrients in such a way that they cannot be separated. These latter combinations are “monstrous hybrids” from the cradle-to-cradle perspective or “products plus”—something we want plus a toxin we do not. Recycling, as Ayres explained, has become more difficult due to increasingly complex materials forming increasingly complex products. His example was the once-profitable wool recycling industry, which has now virtually disappeared because most new clothes are blends of fibers from both the natural and industrial metabolisms that cannot be separated and reprocessed economically.Robert U. Ayres, “Industrial Metabolism: Theory and Practice,” in The Greening of Industrial Ecosystems, ed. Deanna J. Richards and Braden Allenby (Washington, DC: National Academy Press, 1994), 34–35.

    In a sustainable economy, unsalables would not be manufactured. During the transition, unsalables, as a matter of business and public policy, would always belong to the original manufacturer. To guarantee that unsalables are not dumped or otherwise discharged into the environment in irretrievable locations, “waste parking lots” operated perhaps by a public utility would be established so that these products can be stored safely. The original manufacturers of the unsalables would be charged rent for the storage until such time when processes were developed to detoxify their products. All toxic chemicals would contain chemical markers that identify the chemical’s owner, and the owner would be responsible for retrieving, mitigating, or cleaning up its toxins should they be discovered in lakes, wells, soil, birds, or people.Paul Hawken and William McDonough, “Seven Steps to Doing Good Business,” Inc., November 1993, 81; Michael Braungart, “Product Life-Cycle Management to Replace Waste Management,” Industrial Ecology and Global Change, ed. Robert Socolow, Clinton Andrews, Frans Berkhout, and Valerie Thomas (Cambridge: Cambridge University Press, 1994), 335–37.

    The second principle of ecological intelligence, “use current solar income,” is derived from the second law of thermodynamics. Though the earth is a closed system with respect to matter, it is an open system with respect to energy, thanks to the sun. This situation implies that a sustainable, steady-state economy is possible on Earth as long as the sun continues to shine.Robert U. Ayres and Allen V. Kneese, “Externalities: Economics and Thermodynamics,” in Economy and Ecology: Towards Sustainable Development, ed. Franco Archibugi and Peter Nijkamp (Dordrecht, Netherlands: Kluwer Academic Publishers, 1989), 105. Using current solar income requires that Earth capital not be depleted—generally mined and burned—as a way to release energy. Thus all energy must be either solar or from solar-derived sources such as wind power, photovoltaic cells, geothermal, tidal power, and biomass fuels.Geothermal power, although perhaps more plentiful than other sources, ultimately derives from heat within Earth’s mantle and is thus not technically solar derived. Fossilized animals and plants, namely oil and coal, while technically solar sources, fail the current solar income test, and their use violates the imperative to preserve healthy natural system functioning since burning fossil fuels alters climate systems and produces acid rain among other adverse impacts.

    The third principle of ecological intelligence is “respect diversity.” Biodiversity, the characteristic that sustains the natural metabolism, must be encouraged through conscious design. Diversity in nature increases overall ecosystem resilience to exogenous shocks. Clinton Andrews, Frans Berkhout, and Valerie Thomas suggest applying this characteristic to the industrial metabolism to develop a similar robustness.Clinton Andrews, Frans Berkhout, and Valerie Thomas, “The Industrial Ecology Agenda,” in Industrial Ecology and Global Change, ed. Robert Socolow, Clinton Andrews, Frans Berkhout, and Valerie Thomas (Cambridge: Cambridge University Press, 1994), 472–75. (See Andrews’s guiding metaphors for industrial ecology earlier in this section.) Respecting diversity, however, has a broader interpretation than just biological diversity. In its broadest sense, “respect diversity” means “one size does not fit all.” Every location has different material flows, energy flows, culture, and character.William McDonough, “A Boat for Thoreau: A Discourse on Ecology, Ethics, and the Making of Things,” in The Business of Consumption: Environmental Ethics and the Global Economy, ed. Laura Westra and Patricia H. Werhane (Lanham, MD: Rowman and Littlefield, 1998), 297–317. Therefore, this principle attempts to take into account the uniqueness of place by celebrating differences rather than promoting uniformity and monocultures.

    In addition to the requirement of ecological intelligence, an additional criterion similar to the fourth system condition of TNS asks of the design, “Is it just?” Justice from a design perspective can be tricky to define or quantify and instead lends itself to qualitative reflection. However, the sustainable design framework forces an intergenerational perspective of justice through its design principles and product typology. As William McDonough explains, products designed to fit neither the biological nor industrial metabolism inflict “remote tyranny” on future generations as they will be left with the challenges of depleted Earth capital and wastes that are completely useless and often dangerous.William McDonough, “A Boat for Thoreau: A Discourse on Ecology, Ethics, and the Making of Things,” in The Business of Consumption: Environmental Ethics and the Global Economy, ed. Laura Westra and Patricia H. Werhane (Lanham, MD: Rowman and Littlefield, 1998), 297–317.

    Finally, cradle-to-cradle eco-effectiveness “sees commerce as the engine of change” rather than the inherent enemy of the environment and “honors its ability to function quickly and productively.”William McDonough and Michael Braungart, Cradle to Cradle: Remaking the Way We Make Things (New York: North Point Press, 2002), 150. Companies should make money, but they must also protect local cultural and environmental diversity, promote justice, and in McDonough’s world, be fun.

    Nature’s Services

    Nature’s services emerged in the late 1990s as a practical framework to put a monetary value on the services that ecosystems provide to humans to better weigh the trade-offs involved with preserving an ecosystem or converting it to a different use. The nature’s services outlook posits two things. First, “the goods and services flowing from natural ecosystems are greatly undervalued by society…[and] the benefits of those ecosystems are not traded in formal markets and do not send price signals.”Gretchen Daily, ed., Nature’s Services: Societal Dependence on Natural Ecosystems (Washington, DC: Island Press, 1997), 2. Second, we are rapidly reaching a point of no return, where we will have despoiled or destroyed so many ecosystems that the earth can no longer sustain the burgeoning human population. Nature’s systems are too complex for humans to understand entirely, let alone replace if the systems fail. Indeed, Stanford biology professor Gretchen Daily was inspired to edit the book Nature’s Services, published in 1997, after “a small group of us [scientists] gathered to lament the near total lack of public appreciation of societal dependence upon natural ecosystems.”Gretchen Daily, ed., Nature’s Services: Societal Dependence on Natural Ecosystems (Washington, DC: Island Press, 1997), xv. Daily expanded on these concepts in the 2002 book The New Economy of Nature.

    Ecosystem Survival Is Human Survival

    Unless their true social and economic value is recognized in terms we all can understand, we run the grave risk of sacrificing the long-term survival of these natural systems to our short-term economic interests.Gretchen Daily, ed., Nature’s Services: Societal Dependence on Natural Ecosystems (Washington, DC: Island Press, 1997), xx.

    Nature’s services consist primarily of “ecosystem goods” and “ecosystem services.” Natural systems have developed synergistic and tightly intertwined structures and processes within which species thrive, wastes are converted to useful inputs, and the entire system sustains itself, sustaining human life and activity as a subset. For instance, ecosystems services include the carbon and nitrogen cycles, pollination of crops, or the safe decomposition of wastes, all of which can involve species from bacteria to trees to bees. Healthy ecosystems also provide “ecosystem goods, such as seafood, forage, timber, biomass fuels, natural fibers, and many pharmaceuticals, industrial products, and their precursors.”Gretchen Daily, ed., Nature’s Services: Societal Dependence on Natural Ecosystems (Washington, DC: Island Press, 1997), 3. In short, ecosystems provide raw materials for the human economy or provide the conditions that allow humans to have economy in the first place.

    Although these natural goods and services can be valued “biocentrically” (i.e., for their intrinsic worth) or “anthropocentrically” (i.e., for their value to humans), the nature’s services framework focuses on the latter because its audience needs a way to incorporate ecosystems into conventional, cost-benefit calculations for human projects. For instance, if a field is “just there,” the conventional calculation of the cost of converting it to a parking lot will focus much more on the price of asphalt and contractors than on the value lost when the field can no longer filter water, support plants and wildlife, grow food, or provide aesthetic pleasure. A nature’s services outlook instead captures the value of the functioning field so that it can be directly compared to the value of a parking lot.

    Anthropocentric valuation schemes can take numerous forms. They can consider how ecosystems contribute to broad goals of sustainability, fairness, and efficiency or more direct economic activity. For instance, a farmer could calculate the avoided cost of applying pesticides whenever a sound ecosystem or biological method instead controls pests. A state forestry agency could calculate the direct value of consuming ecosystem products, such as the value of trees cut and ultimately sold as lumber, or it could calculate the indirect value of using the same forest for recreation and tourism, perhaps by calculating travel costs and other fees people are willing to bear to use that forest.

    Estimating the value of nature can be difficult, especially because we are not used to thinking about buying and selling its services, such as clean air and clean water, or we see them as so basic that we want them to be free to all. Moreover, most people do not even know the services nature provides or how those services interact. Nonetheless, in addition to the aforementioned methods, economists and others trying to use nature’s services often survey people’s willingness to pay for nature, such as using their willingness to protect an endangered animal as a proxy for their attitude toward that animal’s ecosystem as a whole. One spectrum of approaches to valuation is illustrated in Figure 3.7, where use value reflects present anthropocentric value and nonuse value encompasses biocentric value as well as anthropocentric value for future generations.

    Figure \(\PageIndex{6}\): Ways to Value Nature’s Services. Source: UN Food and Agricultural Organization, “What Are Ecosystem Services,”

    In addition to the uncertainty of ascertaining values for everything an ecosystem can do, nature’s services face the issues of whether some people’s needs should be valued more than others’ and of how present choices will constrain future options. Nature’s services practitioners also must be able to calculate changes in value from incremental damage, not just the total value of an ecosystem. For example, clear-cutting one hundred acres of rain forest to plant palm trees is one problem; eradicating the entire Amazon rain forest is quite another. Destroying the first hundred acres might have a very different cost than destroying the last hundred. Hence the nature’s services approach attempts to characterize with ever greater resolution ecosystems, their goods and services, and the systems interdependence to include the results in economic calculations. Finally, once those values are quantified, their corresponding ecosystems need to be protected as would any other asset. Systems for monitoring and safeguarding nature’s services must emerge concurrently with estimates of their worth.

    Robert Costanza and collaborating scientists and economists wrote one of the first papers on the financial value of ecosystems, “The Value of Ecosystem Services: Putting the Issues in Perspective,” published in Ecological Economics in 1998.Robert Costanza, Ralph d’Arge, Rudolf de Groot, Stephen Farber, Monica Grasso, Bruce Hannon, Karin Limburg, et al., “The Value of Ecosystem Services: Putting the Issues in Perspective,” Ecological Economics 25, no. 1 (April 1998): 67–72, doi:10.1016/S0921-8009(98)00019-6. It and the review article “The Nature and Value of Ecosystem Services” by Kate Brauman, Gretchen Daily, T. Ka’eo Duarte, and Harold Mooney are worth reading for an accessible discussion of ecosystem services.Kate A. Brauman, Gretchen C. Daily, T. Ka’eo Duarte, and Harold A. Mooney, “The Nature and Value of Ecosystem Services: An Overview Highlighting Hydrologic Services,” Annual Review of Environment and Resources 32, no. 6 (2007): 1–32, doi:10.1146/


    Biomimicry, expounded by Janine Benyus in a book of the same name, is “the conscious emulation of life’s genius” to solve human problems in design, industry, and elsewhere.Janine M. Benyus, Biomimicry: Innovation Inspired by Nature (New York: William Morrow, 1997), 2. Biomimicry also spawned a consultancy and nonprofit organization, both based in Montana. The Biomimicry Guild helps companies apply biomimicry’s principles, while the Biomimicry Institute aspires to educate a broad audience and spread those principles. Biomimicry’s core assumption is that four billion years of natural selection and evolution have yielded sophisticated, sustainable, diverse, and efficient answers to problems such as energy use and sustainable population growth. Humans now have the technology to understand many of nature’s solutions and to apply similar ideas in our societies from the level of materials, such as mimicking spider silk or deriving pharmaceuticals from plants, to the level of ecosystems and the biosphere, such as improving our agriculture by learning from prairies and forests or reducing our greenhouse gas emissions by shifting toward solar energy.


    Janine Benyus talks about biomimicry at the 2005 TED conference.

    Biomimicry does not, however, merely exploit nature’s design secrets in conventional industry, whether to make Velcro or genetically engineered corn. Instead, biomimicry requires us to assume a sustainable place within nature by recognizing ourselves as inextricably part of it. Biomimicry focuses “not on what we can extract from the natural world, but on what we can learn from it.”Janine M. Benyus, prologue to Biomimicry: Innovation Inspired by Nature (New York: William Morrow, 1997). This emphasis leads to three precepts: nature is a model for sustainable designs and processes, nature is the measure for successful solutions, and nature is our mentor. It also lends urgency to protecting ecosystems and cataloguing their species and interdependencies so that we may continue to be inspired, aided, and instructed by nature’s ingenuity. In these respects, biomimicry most resembles industrial ecology and nature’s services but clearly shares traits with other frameworks and concepts.

    Nature as the Ultimate Model

    In short, living things have done everything we want to do, without guzzling fossil fuel, polluting the planet, or mortgaging their future. What better models could there be?…This time, we come not to learn about nature so that we might circumvent or control her, but to learn from nature, so that we might fit in, at last and for good, on the Earth from which we sprang.Janine M. Benyus, Biomimicry: Innovation Inspired by Nature (New York: William Morrow, 1997), 2, 9.

    Nature’s ingenuity, meanwhile, displays recurrent “laws, strategies, and principles”:


    • runs on sunlight.
    • uses only the energy it needs.
    • fits form to function.
    • recycles everything.
    • rewards cooperation.
    • banks on diversity.
    • demands local expertise.
    • curbs excesses from within.
    • taps the power of limits.Janine M. Benyus, Biomimicry: Innovation Inspired by Nature (New York: William Morrow, 1997), 7.

    Benyus was frustrated that her academic training in forestry, in contrast, focused on analyzing discrete pieces, which initially prevented her and others from seeing principles that emerge from analyzing entire systems. Similarly, solutions to problems of waste and energy need to operate with the big picture in mind. Benyus explicitly allied biomimicry with industrial ecology and elucidated ten principles of an economy that mimicked nature:Janine M. Benyus, Biomimicry: Innovation Inspired by Nature (New York: William Morrow, 1997), 252–277. Italicized items in the list are Benyus’s wording.

    1. Use waste as a resource. Whether at the scale of integrated business parks or the global economy, “all waste is food, and everybody winds up reincarnated inside somebody else. The only thing the community imports in any appreciable amount is energy in the form of sunlight, and the only thing it exports is the by-product of its energy use, heat.”Janine M. Benyus, Biomimicry: Innovation Inspired by Nature (New York: William Morrow, 1997), 255.
    2. Diversify and cooperate to fully use the habitat. Symbiosis and specialization within niches assure nothing is wasted and provide benefits to other species or parts of the ecosystem just as it does to other companies or parts of industry when businesses collaborate to facilitate efficiency, remanufacturing, and other changes.
    3. Gather and use energy efficiently. Use fossil fuels more efficiently and invest them in producing what truly matters in the long run while shifting to solar and other renewable resources.
    4. Optimize rather than maximize. Focus on quality over quantity.
    5. Use materials sparingly. Dematerialize products and reduce packaging; reconceptualize business as providing services instead of selling goods.
    6. Don’t foul the nests. Reduce toxins and decentralize production of goods and energy.
    7. Don’t draw down resources. Shift to renewable feedstocks but use them at a low enough rate that they can regenerate. Invest in ecological capital.
    8. Remain in balance with the biosphere. Limit emissions of greenhouse gases, chlorofluorocarbons, and other pollutants that severely disrupt natural cycles.
    9. Run on information. Create feedback loops to improve processes and reward environmental behavior.
    10. Shop locally. Using local resources constrains regional populations to sizes that can be supported, reduces transportation needs, and lets people see the impact of their consumption on the environment and suppliers.

    While biomimicry’s concepts can be used at different scales, they have already been directly applied to improve many conventional products. Butterflies alone have provided much help. For example, Lotusan paint uses lessons from the surface structure of butterfly wings to shed dirt and stay cleaner, obviating the need for detergents, while Qualcomm examined how butterfly wings scatter light to develop its low-energy and highly reflective Mirasol display for mobile phones and other electronics. These and other products have been catalogued by the Biomimicry Institute at

    Green Chemistry

    Green chemistry, now a recognized field of research and design activity, grew from the awareness that conventional ways to synthesize chemicals consumed large amounts of energy and materials and generated hazardous waste, while the final products themselves were often toxic to humans and other life and persisted in the environment. Hence green chemistry seeks to produce safer chemicals in more efficient and benign ways as well as to neutralize existing contaminants. Such green chemicals typically emulate the nontoxic components and reactions of nature.


    1,300 Liters of Solvent for 1 Kilogram of Viagra

    Green chemistry emerged as a field after the US Environmental Protection Agency (EPA) began the program “Alternative Synthetic Pathways for Pollution Prevention” in response to the 1990 Pollution Prevention Act. In 1993 the program, renamed “Green Chemistry,” established the Presidential Green Chemistry Challenge Award to encourage and recognize research that replaces dangerous chemicals and manufacturing processes with safer alternatives. Recent winners of the award have created ways to make cosmetics and personal products without solvents and an efficient way to convert plant sugars into biofuels.US Environmental Protection Agency, “Presidential Green Chemistry Challenge: Award Winners,” last updated July 28, 2010, accessed December 3, 2010, In 1997, the nonprofit Green Chemistry Institute was established and would later become part of the American Chemistry Society. The following year, the Organization for European Economic Development (OECD) created the Sustainable Chemistry Initiative Steering Group, and Paul Anastas and John Warner’s book Green Chemistry: Theory and Practice established twelve principles for green chemistry.Paul T. Anastas and John C. Warner, Green Chemistry: Theory and Practice (Oxford: Oxford University Press, 1998). The principles are quoted on the EPA website, US Environmental Protection Agency, “Green Chemistry: Twelve Principles of Green Chemistry,” last updated April 22, 2010, accessed December 1, 2010, Recognized as leaders in the green chemistry field, Anastas and Warner have continued to advance the ideas through innovation, education, and policy, with Warner helping to create the Warner Babcock Institute to support this mission. Paul Anastas, meanwhile, was confirmed as head of the EPA’s Office of Research and Development in 2010. Their green chemistry principles are reflected in a hierarchy of goals set by the Green Chemistry program:

    1. Green Chemistry: Source Reduction/Prevention of Chemical Hazards
      • Design chemical products to be less hazardous to human health and the environment*
      • Use feedstocks and reagents that are less hazardous to human health and the environment*
      • Design syntheses and other processes to be less energy and materials intensive (high atom economy, low feed factor)
      • Use feedstocks derived from annually renewable resources or from abundant waste
      • Design chemical products for increased, more facile reuse or recycling
    2. Reuse or Recycle Chemicals
    3. Treat Chemicals to Render Them Less Hazardous
    4. Dispose of Chemicals Properly

      *Chemicals that are less hazardous to human health and the environment are:

      • Less toxic to organisms and ecosystems
      • Not persistent or bioaccumulative in organisms or the environment
      • Inherently safer with respect to handling and useUS Environmental Protection Agency, “Introduction to the Concept of Green Chemistry: Sustainable Chemistry Hierarchy,” last updated April 22, 2010, accessed December 1, 2010,
    Figure \(\PageIndex{7}\): Goals for Production of Green Chemicals. James Clark, a chemist who leads the Green Chemistry Centre of Excellence at the University of York, England, has summarized the goals of green chemistry in an octagon. This octagon likewise stresses efficiency, renewable feedstocks, and human and environmental health. Source: James H. Clark, “Green Chemistry: Challenges and Opportunities,” Green Chemistry 1, no. 1 (1999): 1–8.

    Green chemistry also refers to a journal devoted to the topic (Green Chemistry), and one of its associate editors, Terry Collins, has identified steps to expand green chemistry. First, incorporate environmental considerations and sustainability ethics into the training of all chemists and their decisions in the laboratory. Second, be honest about the terms green or sustainable and the evidence for the harm chemicals cause. For instance, a cleaner, more efficient way to produce a certain product may be progress, but if the product itself remains highly toxic and persistent in the environment, it is not exactly green. Consequently, “since many chemical sustainability goals such as those associated with solar energy conversion call for ambitious, highly creative research approaches, short-term and myopic thinking must be avoided. Government, universities, and industry must learn to value and support research programs that do not rapidly produce publications, but instead present reasonable promise of promoting sustainability.”Terry Collins, “Toward Sustainable Chemistry,” Science 291, no. 5501 (2001): 48–49.

    Collins has devised ways to degrade toxic chemicals already in the environment. He formed a spin-off from Carnegie Mellon University, GreenOx Catalysts, to develop and market his products, which have safely broken down anthrax as well as hazardous waste from paper pulp mills. Green chemistry, however, does not exist merely in government or university enclaves. In 2006, the Dow Chemical Company, with annual sales over $50 billion, declared sustainable chemistry as part of its corporate strategy.Dow Chemical, “Innovative Insect Control Technology Earns Dow Another Green Chemistry Award,” news release, June 26, 2008, accessed June 26, 2009,; Dow Chemical, “Dow Sustainability—Sustainability at Dow,” accessed June 26, 2009, DuPont, meanwhile, created a Bio-Based Materials division that has focused on using corn instead of petroleum to produce polymers for a variety of applications, from carpets to medical equipment, while also reducing greenhouse gas emissions.DuPont, “DuPont Bio-Based Materials—Delivering Sustainable Innovations That Reduce Reliance on Fossil Fuels,” fact sheet, accessed June 26, 2009, DupontNew&Entity=PRAsset&SF_PRAsset_PRAssetID_EQ=101244&XSL=MediaRoomText &PageTitle= Fact%20Sheet&IncludeChildren=true&Cache=. Since synthetic chemicals are the basic building blocks of most modern products, from shoes to iPhones to food preservatives, green chemistry can play a significant role in sustainability. Cradle-to-cradle design, earth systems engineering, and virtually every other framework and tool can benefit from more environmentally friendly materials at the molecular level. As John Warner, a key figure in educating companies about green chemistry providing innovation and new materials across sectors, states,

    The field of chemistry has been around in a modern interpretation for about 150 years, [and] we have invented our pharmaceuticals, our cosmetics, our materials, in a mindset that has never really focused on sustainability, toxicity and environmental impact. When one shifts to thinking in that way, it actually puts you in a new innovative space. In that new innovative space, that is the hallmark of creativity. What companies find is instead of it slowing them down, it accelerates time to market because they run into less hurdles in the regulatory process and in the manufacturing process. And it puts them in spaces that they weren’t normally in because they’ve approached it from another angle. Chemicals policy creates the demand. Green chemistry is not chemical policy. Green chemistry is the supply side, the science of identifying those alternatives. And so hand in hand, those two efforts accomplish the goals of more sustainable futures. But they’re not the same.Jonathan Bardelline interview of John Warner, “John Warner: Building Innovation Through Green Chemistry,” October 18, 2010, accessed March 7, 2011, green-chemistry?page=0%2C1.

    Green Engineering

    Green engineering, as articulated by Paul Anastas and Julie Zimmerman, is a framework that can be applied at scales ranging from molecules to cities to improve the sustainability of products and processes. Green engineering works from a systems viewpoint and is organized around twelve principles that should be optimized as a system. For instance, one should not design a product for maximum separation and purification of its components (principle 3) if that choice would actually degrade the product’s overall sustainability.

    The Twelve Principles of Green Engineering
    • Principle 1: Designers need to strive to ensure that all material and energy inputs and outputs are as inherently nonhazardous as possible.
    • Principle 2: It is better to prevent waste than to treat or clean up waste after it is formed.
    • Principle 3: Separation and purification operations should be designed to minimize energy consumption and materials use.
    • Principle 4: Products, processes, and systems should be designed to maximize mass, energy, space, and time efficiency.
    • Principle 5: Products, processes, and systems should be “output pulled” rather than “input pushed” through the use of energy and materials.
    • Principle 6: Embedded entropy and complexity must be viewed as an investment when making design choices on recycle, reuse, or beneficial disposition.
    • Principle 7: Targeted durability, not immortality, should be a design goal.
    • Principle 8: Design for unnecessary capacity or capability (e.g., “one size fits all”) solutions should be considered a design flaw.
    • Principle 9: Material diversity in multicomponent products should be minimized to promote disassembly and value retention.
    • Principle 10: Design of products, processes, and systems must include integration and interconnectivity with available energy and materials flows.
    • Principle 11: Products, processes, and systems should be designed for performance in a commercial “afterlife.”
    • Principle 12: Material and energy inputs should be renewable rather than depleting.Paul Anastas and Julie Zimmerman, “Design through the Twelve Principles of Green Engineering,” Environmental Science and Technology 37, no. 5 (2003): 95A.

    Green engineering considers two basic priorities above all others: “life-cycle considerations” and “inherency.” Life-cycle considerations require engineers and designers to understand and assess the entire context and impact of their products from creation to end of use. Inherency means using and producing inherently safe and renewable or reusable materials and energies. Inherency sees external ways to control pollution or contain hazards as a problem because they can fail and tend to tolerate or generate waste. In this sense, inherency is a stringent form of pollution prevention.

    Meanwhile, waste is a concept important in many of the principles of green engineering. As Anastas and Zimmerman explain, “An important point, often overlooked, is that the concept of waste is human. In other words, there is nothing inherent about energy or a substance that makes it a waste. Rather it results from a lack of use that has yet to be imagined or implemented.”Paul Anastas and Julie Zimmerman, “Design through the Twelve Principles of Green Engineering,” Environmental Science and Technology 37, no. 5 (2003): 97A. Waste often has been designed into systems as a tolerable nuisance, but increasingly, we cannot deal with our waste, whether toxins, trash, or ineffective uses of energy and resources. To avoid material waste, for example, we can design products to safely decompose shortly after their useful lifetime has passed (e.g., there is no point in having disposable diapers that outlast infancy by millennia). To avoid wastes within larger systems, we can stop overdesigning them based on worst-case scenarios. Instead, we should design flexibility into the system and look to exploit local inputs and outputs, as the way a hybrid car recovers energy from braking to recharge its battery whereas a conventional car loses that energy as heat. We can also recognize that some highly complex objects such as computer chips may be better off being collected and reused, whereas simpler objects such as paper bags may be better off being destroyed and recycled. In essence, green engineering advocates avoiding waste and hazards to move toward sustainability through more thorough, creative planning and design.

    Summary of Perspective of Green Engineering
    Input Output
    Material Renewable/recycled, nontoxic Easily separable and recyclable/reusable, nontoxic, no waste (eliminated or feedstock for something else)
    Energy Renewable, not destructive to obtain No waste (lost heat, etc.), nontoxic (no pollution, etc.)
    Human intelligence Creative, systems-level design to avoid waste, renew resources, and so forth in new products and processes Sustainability

    Life-Cycle Analysis

    Life-cycle analysis (LCA) methods are analytical tools for determining the environmental and health impacts of products and processes from material extraction to disposal. Engaging in the LCA process helps reveal the complex resource web that fully describes the life of a product and aids designers (among others) in finding ways to reduce or eliminate sources of waste and pollution. A cup of coffee is commonly used to illustrate the resource web of a product life cycle.

    The journey of the cup of coffee begins with the clearing of forests in Colombia to plant coffee trees. The coffee trees are sprayed with insecticides manufactured in the Rhine River Valley of Europe; effluents from the production process make the Rhine one of the most polluted rivers in the world, with much of its downstream wildlife destroyed. When sprayed, the insecticides are inadvertently inhaled by Colombian farmers, and the residues are washed into rivers, adversely affecting downstream ecosystems. Each coffee tree yields beans for about forty cups of coffee annually. The harvested beans are shipped to New Orleans in a Japanese-constructed freighter made from Korean steel, the ore of which is mined on tribal lands in Papua New Guinea. In New Orleans, the beans are roasted and then packaged in bags containing layers of polyethylene, nylon, aluminum foil, and polyester. The three plastic layers were fabricated in factories along Louisiana’s infamous “Cancer Corridor,” where polluting industries are located disproportionately in African American neighborhoods. The plastic was made from oil shipped in tankers from Saudi Arabia. The aluminum foil was made from Australian bauxite strip-mined on aboriginal ancestral land and then shipped in barges fueled by Indonesian oil to refining facilities in the Pacific Northwest. These facilities derive their energy from the hydroelectric dams of the Columbia River, which have destroyed salmon fishing runs considered sacred by Native American groups. The bags of coffee beans are then shipped across the United States in trucks powered by gasoline from Gulf of Mexico oil refined near Philadelphia, a process that has contributed to serious air and water pollution, fish contamination, and the decline of wildlife in the Delaware River basin. And all of this ignores the cup that holds the coffee.Alan Thein Durning and Ed Ayres, “The History of a Cup of Coffee,” World Watch 7, no. 5 (September/October 1994): 20–23.

    The coffee example illustrates the complexity in conducting an LCA. The LCA provides a systems perspective but is essentially an accounting system. It attempts to account for the entire resource web and all associated points of impact and thus is understandably difficult to measure with complete accuracy. The Society for Environmental Chemistry has developed a standard methodology for LCA. The following are the objectives of this process:Joseph Fiksel, “Methods for Assessing and Improving Environmental Performance,” in Design for Environment: Creating Eco-Efficient Products and Processes, ed. Joseph Fiksel (New York: McGraw Hill, 1996), 116–17.

    • Develop an inventory of the environmental impacts of a product, process, or activity by identifying and measuring the materials and energy used as well as the wastes released into the environment.
    • Assess the impact on the environment of the materials and energy used and released.
    • Evaluate and implement strategies for environmental improvement.

    The process of conducting an LCA often reveals sources of waste and opportunities for redesign that would otherwise remain unnoticed. As Massachusetts Institute of Technology professor and author John Ehrenfeld points out, “Simply invoking the idea of a life cycle sets the broad dimensions of the framework for whatever follows and, at this current stage in ecological thinking, tends to expand the boundaries of the actors’ environmental world.”John Ehrenfeld, “The Importance of LCAs—Warts and All,” Journal of Industrial Ecology 1, no. 2 (1997): 46. LCAs can be used not only as a tool during the design phase to identify environmental hotspots in need of attention but also as a tool to evaluate existing products and processes. LCA may also be used to compare products. However, one must be careful that the same LCA methodologies are used for each item compared to guarantee accurate relative results.

    LCA has several limitations. The shortcomings most commonly cited include the following:

    • Defining system boundaries for LCA is controversial.
    • LCA is data-intensive and expensive to conduct.
    • Inventory assessment alone is inadequate for meaningful comparison, yet impact assessment is fraught with scientific difficulties.
    • LCA does not account for other, nonenvironmental aspects of product quality and cost.
    • LCA cannot capture the dynamics of changing markets and technologies.
    • LCA results may be inappropriate for use in eco-labeling.Joseph Fiksel, “Methods for Assessing and Improving Environmental Performance,” in Design for Environment: Creating Eco-Efficient Products and Processes, ed. Joseph Fiksel (New York: McGraw Hill, 1996), 113.

    Concurrent Engineering

    Concurrent engineering is a design philosophy that brings together the players in a product’s life cycle during the design stage. It presents an opportunity to integrate environmental protection in the design process with input from representatives across the entire product life cycle. Participants in a concurrent engineering design team include representatives of management, sales and marketing, design, research and development, manufacturing, resource management, finance, field service, customer interests, and supplier interests. The team’s goal is to improve the quality and usability of product designs, improve customer satisfaction, reduce cost, and ease the transition of the product from design to production. Definitions of concurrent engineering vary, but the key concepts include using a team to represent all aspects of the product life cycle, focusing on customer requirements and developing production and field support systems early in the design process.Susan E. Carlson and Natasha Ter-Minassian, “Planning for Concurrent Engineering,” Medical Devices and Diagnostics Magazine, May 1996, 202–15.

    While seemingly a commonsense approach to design, concurrent engineering is far from typical in industry. The traditional procedure for product design is linear, where individuals are responsible only for their specific function, and designs are passed from one functional area (e.g., manufacturing, research and development, etc.) to the next. This approach can be characterized as throwing designs “over the wall.” For example, an architect may design a building shell, such as a steel skyscraper around an elevator core, and then pass the plans to a construction engineer who has to figure out how to route the heating, ventilating, and air-conditioning ducts and other building components. This disjunction can create inefficiency. Concurrent engineering instead would consider the many services a building provides—for example, lighting, heating, cooling, and work space—and determine the most efficient ways to achieve them all from the very beginning. Concurrent engineering therefore shortens the product development cycle by increasing communication early, resulting in fewer design iterations.Susan E. Carlson and Natasha Ter-Minassian, “Planning for Concurrent Engineering,” Medical Devices and Diagnostics Magazine, May 1996, 202–15.

    Companies that employ a concurrent engineering design philosophy feature empowered design teams that are open to interaction, new ideas, and differing viewpoints.Susan Carlson-Skalak, lecture to Sustainable Business class (Darden Graduate School of Business Administration, University of Virginia, Charlottesville, VA, November 17, 1997). Concurrent engineering then is an effective vehicle to implement product design frameworks such as DfE, sustainable design, and even the process-oriented tool TNS, which is not a design framework per se but can be used effectively as a guide to change decision making during design.

    Design for Environment

    DfE is an eco-efficiency strategy that allows a company to move beyond end-of-the-pipe and in-the-pipe concepts like pollution control and pollution prevention to a systems-based, strategic, and competitively critical approach to environmental management and protection.Braden R. Allenby, “Integrating Environment and Technology: Design for Environment,” in The Greening of Industrial Ecosystems, ed. Deanna J. Richards and Braden Allenby (Washington, DC: National Academy Press, 1994), 140–41. It is a proactive approach to environmental protection in which the entire life-cycle environmental impact of a product is considered during its design.Thomas E. Graedel, Paul Reaves Comrie, and Janine C. Sekutowski, “Green Product Design,” AT&T Technical Journal 74, no. 6 (November/December 1995): 17. DfE is intended to be a subset of the Design for X system, where X may be assembly, compliance, environment, manufacturability, material logistics and component applicability, orderability, reliability, safety and liability prevention, serviceability, and testability.Thomas E. Graedel and Braden R. Allenby, Industrial Ecology (Englewood Cliffs, NJ: Prentice Hall, 1995), 186–87. Design for an end goal allows properties necessary to achieve that goal to be integrated most efficiently into a product’s life cycle. Hence DfE, like concurrent engineering, becomes a critical tool for realizing many aspirations of frameworks, such as cradle-to-cradle, or other tools, such as green supply chains.

    Within the domain of DfE are such concepts as design for disassembly, refurbishment, component recyclability, and materials recyclability. These concepts apply to reverse logistics, which allow materials to be collected, sorted, and reintegrated into the manufacturing supply stream to reduce waste. Reverse logistics become especially important for green supply chains.

    DfE originated in 1992, mostly through the efforts of a few electronics firms, and is described by Joseph Fiksel as “the design of safe and eco-efficient products.”Joseph Fiksel, “Introduction,” in Design for Environment: Creating Eco-Efficient Products and Processes, ed. Joseph Fiksel (New York: McGraw Hill, 1996), 3; Joseph Fiksel, “Conceptual Principles of DFE,” in Design for Environment: Creating Eco-Efficient Products and Processes, ed. Joseph Fiksel (New York: McGraw Hill, 1996), 51. These products should minimize environmental impact, be safe, and meet or exceed all applicable regulations; be designed to be reused or recycled; reduce material and energy consumption to optimal levels; and ultimately be environmentally safe when disposed. In accomplishing this, the products should also provide a competitive advantage for a company.Bruce Paton, “Design for Environment: A Management Perspective,” in Industrial Ecology and Global Change, ed. Robert Socolow, Clinton Andrews, Frans Berkhout, and Valerie Thomas (Cambridge: Cambridge University Press, 1994), 350.

    Green Supply Chain

    Green supply-chain management requires that sustainability criteria be considered by every participant in a supply chain at every step from design to material extraction, manufacture, processing, transportation, storage, use, and eventual disposal or recycling. A green supply-chain approach takes a broader systems view than conventional supply-chain management, which assumes basically that different entities take raw materials at the beginning of the supply chain and transform them into a product at the end of the supply chain, with environmental costs to be borne by other companies, countries, or consumers, since each link in the supply chain receives an input without asking about its origins and forgets about the output once it’s out the door. In contrast, the green supply chain considers the entire pathway and internalizes some of these environmental costs to ultimately turn them into sources of value.

    Green supply chains thus modify conventional supply chains in two significant ways: they increase sustainability and efficiency in the existing forward supply chain and add an entirely new reverse supply chain. A green supply chain encourages collaboration among members of the chain to understand and share sustainability performance standards, best practices, innovations, and technology while the product moves through the chain. It also seeks to reduce waste along the forward supply chain and to reduce and ideally eliminate hazardous or toxic materials, replacing them with safer ones whenever possible. Finally, through the reverse supply chain, green supply chains seek to recover materials after consumption rather than return them to the environment as waste.

    Expanded reverse logistics would ultimately replace the linearity of most production methods—raw materials, processing, further conversions and modification, ultimate product, use, disposal—with a cradle-to-cradle, cyclical path or closed loop that begins with the return of used, outmoded, out of fashion, and otherwise “consumed” products. The products are either recycled and placed back into the manufacturing stream or broken down into compostable materials. The cycle is never ending as materials return in safe molecular structures to the land (taken up and used by organisms as biological nutrients) or are perpetually used within the economy as input for new products (technical nutrients). Consequently, green supply chains appear implicitly in many conceptual frameworks while drawing on various sustainability tools, such as LCA and DfE.

    Companies typically funnel spent items from consumers into the reverse supply chain by either leasing their products or providing collection points or other means to recover the items once their service life has ended.Shad Dowlatshahi, “Developing a Theory of Reverse Logistics,” Interfaces: International Journal of the Institute for Operations Research and the Management Sciences 30, no. 3 (May/June 2000): 143–55. Once collected, whether by the original manufacturer or a third party, the products can be inspected and sorted. Some items may return quickly to the supply chain with only minimal repair or replacement of certain components, whereas other products may need to be disassembled, remanufactured, or cannibalized for salvageable parts while the remnant is recycled or sent to a landfill or incinerator.

    Concern for green supply-chain topics emerged in the 1990s as globalization and outsourcing made supply networks increasingly complex and diverse while new laws and consumer expectations demanded companies take more responsibility for their product across the product’s entire life.Jonathan D. Linton, Robert Klassen, and Vaidyanathan Jayaraman, “Sustainable Supply Chains: An Introduction,” Journal of Operations Management 25, no. 6 (November 2007): 1075–82; National Environmental Education and Training Foundation, Going Green Upstream: The Promise of Supplier Environmental Management (Washington, DC: National Environmental Education and Training Foundation, 2001). The green supply chain responds to these complex interacting systems to reduce waste, mitigate legal and environmental risks, reduce adverse health impacts throughout the value added process, improve the reputations of companies and their products, and enable compliance with increasingly stringent regulations and societal expectations. Thus green supply chains can boost efficiency, value, and access to markets, which then boost a company’s environmental, social, and economic performance.

    Carbon Footprint Analysis

    Carbon footprint analysis is a tool that organizations can use to measure direct and indirect emissions of greenhouse gases associated with their provision of goods and services. Carbon footprint analysis is also known as a greenhouse gas inventory, while greenhouse gas accounting describes the general practice of measuring corporate greenhouse gas emissions. The measurement of greenhouse gas emissions (1) allows voluntarily disclosure of data to organizations such as the Carbon Disclosure Project, (2) facilitates participation in mandatory emissions regulatory systems such as the Regional Greenhouse Gas Initiative, and (3) encourages the collection of key operational data that can be used to implement business improvement projects.

    Similar to generally accepted accounting principles in the financial world, a set of standards and principles has emerged that guide data collection and reporting in this new area. In general, companies and individuals calculate their corporate emissions footprint for a twelve-month period. They are also increasingly calculating the footprint of individual products, services, events, and so forth. Established guidelines for greenhouse gas accounting, such as the Greenhouse Gas Protocol, define the scope and methodology of the footprint calculation.

    The Greenhouse Gas Protocol, one commonly accepted methodology, is an ongoing initiative of the World Resources Institute and the World Business Council for Sustainable Development.The Greenhouse Gas Protocol Initiative, “About the GHG Protocol,” accessed July 2, 2009, The Greenhouse Gas Protocol explains how to do the following:

    1. Determine organizational boundaries. Corporate structures are complex and include wholly owned operations, joint ventures, and other entities. The protocol helps managers define which elements compose the “company” for emissions quantification.
    2. Determine operational boundaries. Once managers identify which branches of the organization are to be included, they must identify and evaluate which specific emissions sources will be included.
    3. Identify indirect sources. Sources that are not directly owned or controlled by the company but that are nonetheless influenced by its actions are called indirect sources, for instance, electricity purchased from utilities that produce indirect emissions at the power plant or emissions from employee commuting, suppliers’ activities, and so forth.
    4. Track emissions over time. Companies must select a “base year” against which future emissions will be measured, establish an accounting cycle, and determine other aspects of how they will track emissions over time.
    5. Collect data and calculate emissions. The protocol provides specific guidance about how to collect source data and calculate emissions of greenhouse gases. As a rule of thumb, the amount of energy consumed is multiplied by a series of source-specific “emissions factors” to estimate the quantity of each greenhouse gas produced by the source. Because multiple greenhouse gases are measured in the inventory process, the emissions for each type of gas are then multiplied by a “global warming potential” (GWP) to generate a “CO2 equivalent” to facilitate streamlined reporting of a single emissions number. CO2 is the base because it is the most abundant greenhouse gas and also the least potent one.United Nations Framework Convention on Climate Change, “GHG Data: Global Warming Potentials,” accessed July 2, 2009, For instance, over a century, methane would cause over twenty times more warming than an equal mass of CO2:

    Total emissions in \(CO_2eq\) = σ(fuel consumed × fuel emissions factor × GWP).

    The method for calculating emissions from a single facility or vehicle is the same as that for calculating emissions for thousands of retail stores or long-haul trucks; hence, quantifying the emissions of a Fortune 500 firm or a small employee-owned business involves the same process.

    Figure \(\PageIndex{8}\): Carbon Footprint of the US Economy. Source: “Carbon Footprint of Best Conserving Americans Is Still Double Global Average,” Science Daily, April 29, 2008, accessed March 14, 20 11,

    Companies can reduce their carbon footprint by reducing emissions or acquiring “offsets,” actions taken by an organization or individual to counterbalance the emissions, by either preventing emissions somewhere else or removing CO2 from the air, such as by planting trees. Offsets are traded in both regulated (i.e., government-mandated) and unregulated (i.e., voluntary) markets, although standards for the verification of offsets continue to evolve due to questions about the quality and validity of some products. A company can theoretically be characterized as “carbon neutral” if it causes no net emissions over a designated time period, meaning that for every unit of emissions released an equivalent unit of emissions has been offset through other reduction measures or that the company uses energy only from nonpolluting sources.

    Figure \(\PageIndex{9}\): Carbon Footprint of Individuals. Source: “Carbon Footprint of Best Conserving Americans Is Still Double Global Average,” Science Daily, April 29, 2008, accessed March 14, 20 11,
    • Business systems and the economy are subsystems of the biosphere.
    • Businesses, including companies and supply chains and their interdependent ties to natural systems, like those natural systems, are composed of material, energy, and information flows.
    • Mutually reinforcing compatibility between business and natural systems supports prosperity while sustaining and expanding the goods and services ecosystem services provide.
    • Biologically inspired business models and product designs can offer profitable paths forward.
    • Constraints, rather than limiting possibilities, can open up new space for business innovation and redesign.
    1. Select a product you use frequently. Describe its current life cycle and component and material composition based on what you know and can determine from a short search for information. Then describe how this same product would be designed, used, and handled through the end of its life if the product’s designers used the ideas introduced in this chapter. Be specific about what concepts and tools you are applying to your analysis.
    2. Explain what is meant by this quotation from Chapter 3, Section 3.4: “Eco-efficiency, an increasingly popular concept used by business to describe incremental improvements in material use and environmental impact, is only one small part of a richer and more complex web of ideas and solutions.…more efficient production by itself could become not the servant but the enemy of a durable economy.”
    3. Describe the ramifications when a company’s activities are not all at the same location along the continuum of sustainability.
    4. Where have you seen the sustainability design ideas discussed in this chapter applied? Write a paragraph describing your observations. What new insights have you gained through exposure to these ideas?

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