Reid Lifset

Industrial ecology: goals and definitions

Setting out the goals and boundaries of an emerging field is a hapless task. Set them too conservatively and the potential of the field is thwarted. Set them too expansively and the field loses its distinctive identity. Spend too much time on this task and scarce resources may be diverted from making concrete progress in the field. But in a field with a name as provocative and oxymoronic as industrial ecology, the description of the goals and definitions is crucial. Hence this introductory chapter describes the field of industrial ecology, identifying its key topics, characteristic approaches and tools. The objective is to provide a map of the endeavors that comprise industrial ecology and how those endeavors relate to each other. In doing so, we seek to provide a common basis of discussion, allowing us then to delve into more conceptual discussions of the nature of the field. No field has unanimity on goals and boundaries. A field as new and as ambitious as industrial ecology surely has a long way to go to achieve even a measure of consensus on these matters, but, as we hope this chapter shows, there is much that is coalescing in research, analysis and practice.

The Multilevel Cycle of Anthropogenic Zinc

Summary A comprehensive annual cycle for stocks and flows of zinc, based on data from circa 1994 and incorporating information on extraction, processing, fabrication, use, discard, recycling, and landfilling, was carried out at three discrete governmental unit levels—54 countries and 1 country group (which together comprise essentially all global anthropogenic zinc stocks and flows), nine world regions, and the planet as a whole. All of these cycles are available in an electronic supplement to this article, which thus provides a metadata set on zinc flows for the use of industrial ecology researchers. A “best estimate” global zinc cycle was constructed to resolve aggregation discrepancies. Among the most interesting results are the following: (1) The accumulation ratio, that is, addition to in-use stock as a function of zinc entering use, is positive and large (2/3 of zinc entering use is added to stock) (country, regional, and global levels); (2) secondary input ratios (fractions of input to fabrication that are from recycled zinc) and domestic recycling percentages (fractions of discarded zinc that are recycled) differ among regions by as much as a factor of six (regional level); (3) worldwide, about 40% of the zinc that was discarded in various forms was recovered and reused or recycled (global level); (4) zinc cycles can usefully be characterized by a set of ratios, including, notably, the utilization efficiency (the ratio of manufacturing waste to manufacturing output: 0.090) and the prompt scrap ratio (new scrap as a fraction of manufacturing input: 0.070) (global level). Because capturable discards are a significant fraction of primary zinc inputs, if a larger proportion of discards were recaptured, extraction requirements would decrease significantly (global level). The results provide a framework for complementary studies in resource stocks, industrial resource utilization, energy consumption, waste management, industrial economics, and environmental impacts.

The contemporary European copper cycle: The characterization of technological copper cycles

Abstract Copper is an example of an anthropogenically utilized material that is of interest to both resource economists and environmental scientists. It is a widely employed industrial metal, and one that in certain forms and concentrations is moderately biotoxic. It is also one that may be potentially supply-limited. A comprehensive accounting of the anthropogenic mobilization and use of copper must treat a series of life stages: mining and processing, fabrication, utilization, and end of life. Reservoirs in which copper resides include the lithosphere, ore and ingot processing facilities, fabricators, at least a dozen major uses, several intentional and default stockpiles, landfills, and the environment. The flow rates among those reservoirs constitute the cycle. If a non-global cycle is being constructed, imports to and exports from the region of interest must also be included. In this paper we discuss the characteristics of each of the components of anthropogenic copper cycles, as well as generic approaches to the acquisition and evaluation of data over space and time. Data quality and data utility are evaluated, noting that information relevant to technology and resource policy is easier to acquire than is information relevant to human health and ecosystem concerns, partly because the spatial scale required by the latter is considerably smaller and the flow rates rarely analyzed and reported. Despite considerable data limitations, we conclude that information is sufficiently available and the data sufficiently accurate to characterize copper cycles at a variety of spatial scales.

Life-cycle assessment of biofuels, convergence and divergence.

Recently, there has been an explosion of life-cycle assessment (LCA) studies of biofuels to support biofuel policy making. It is difficult to draw general conclusions from the set of studies due to the variation in outcomes. Causes of this variation include real-world differences, data uncertainties and methodological choices. In this review we explore some of the more complicated sources of differences in findings related to LCA methodology by reviewing 67 LCA studies published between 2005 and 2010. A very important and particularly difficult problem to solve is coproduct allocation. Different allocation methods, all approved under the International Organization for Standardization (ISO) standard for LCA studies, can cause improvement percentages compared with fossil fuels to vary from negative to above 100%. The treatment of biogenic carbon is another important issue. Most studies include neither extractions nor emissions of biogenic CO2, but a number of these LCAs do include both, leading to very different conclusions on greenhouse gas performance of biofuel chains.

Trust, but Verify

It turns out that “trust but verify” is also good advice for evaluating risk and determining rates for prospective customers. However, as the subprime vehicle market continues to grow most dealers and lenders still rely on traditional credit scores and customer-reported details to maintain stability of their loan portfolios. Unfortunately, these may not be the most accurate or comprehensive ways to assess borrowers’ qualifications:

The characterization of technological zinc cycles

A comprehensive accounting of the anthropogenic mobilization of zinc must treat a series of life stages: mining and processing, fabrication, utilization, and end of life. Reservoirs in which zinc resides include the lithosphere, ore and ingot processing facilities, at least a dozen major uses, several intentional and default stockpiles, landfills, and the environment. The flow rates among those reservoirs constitute the technological cycle. If a non-global cycle is being constructed, imports to and exports from the region of interest must also be included. In this paper we discuss generic approaches to the acquisition and evaluation of data for each of the components of anthropogenic zinc cycles over space and time. Data quality and data utility are evaluated, noting that information relevant to technology and resource policy is easier to acquire than is information relevant to human health and ecosystem concerns, partly because the spatial scale required by the latter is considerably smaller and the flow rates rarely analyzed and reported. Despite considerable data limitations, we conclude that information is sufficiently available and accurate to permit reasonably quantitative zinc cycles to be characterized at a variety of spatial scales.

Where has all the copper gone: The stocks and flows project, part 1

The quantitative assessment of stocks and flows of materials throughout the technological cycle, from resource extraction to final disposal, can inform resource policy, environmental science, and waste management. This paper describes the technological cycle of copper based on work by the Stocks and Flows Project of the Yale Center for Industrial Ecology. Of copper produced in the 20th century, as much as 85% remains in use today. The recycling rate, while high, leaves nearly as much in waste destined for disposal (e.g., over 40% in the United States). The copper in production wastes currently approaches the quantity in post-consumer wastes, but the latter will dwarf the former over time as large in-use stocks reach end of life.

Metal lost and found: dissipative uses and releases of copper in the United States 1975-2000.

Metals are used in a variety of ways, many of which lead to dissipative releases to the environment. Such releases are relevant from both a resource use and an environmental impact perspective. We present a historical analysis of copper dissipative releases in the United States from 1975 to 2000. We situate all dissipative releases in coppers life cycle and introduce a conceptual framework by which copper dissipative releases may be categorized in terms of intentionality of use and release. We interpret our results in the context of larger trends in production and consumption and government policies that have served as drivers of intentional copper releases from the relevant sources. Intentional copper releases are found to be both significant in quantity and highly variable. In 1975, for example, the largest source of intentional releases was from the application of copper-based pesticides, and this decreased more than 50% over the next 25 years; all other sources of intentional releases increased during that period. Overall, intentional copper releases decreased by approximately 15% from 1975 to 2000. Intentional uses that are unintentionally released such as copper from roofing, increased by the same percentage. Trace contaminant sources such as fossil fuel combustion, i.e., sources where both the use and the release are unintended, increased by nearly 50%. Intentional dissipative uses are equivalent to 60% of unintentional copper dissipative releases and more than five times that from trace sources. Dissipative copper releases are revealed to be modest when compared to bulk copper flows in the economy, and we introduce a metric, the dissipation index, which may be considered an economy-wide measure of resource efficiency for a particular substance. We assess the importance of dissipative releases in the calculation of recycling rates, concluding that the inclusion of dissipation in recycling rate calculations has a small, but discernible, influence, and should be included in such calculations.

Implementing Individual Producer Responsibility for Waste Electrical and Electronic Equipment Through Improved Financing

Under the European Union (EU) Waste Electrical and Electronics Equipment (WEEE) Directive, producers are responsible for financing the recycling of their products at end of life. A key intention of such extended producer responsibility (EPR) legislation is to provide economic incentives for producers to develop products that are easier to treat and recycle at end of life. Recent research has shown, however, that the implementation of EPR for WEEE has so far failed in this respect. Current WEEE systems calculate their prices according to simple mass‐based allocation of costs to producers, based on broad collection categories containing a mixture of different product types and brands. This article outlines two alternative approaches, which instead calculate charges for products sold by producers by classifying them according to their eventual end‐of‐life treatment requirements and cost. Worked examples indicate that these methods provide both effective and efficient frameworks for financing WEEE, potentially delivering financial incentives to producers substantial enough to affect their potential profitability and, as a likely consequence, the decisions relating to the design of their products. In particular they fulfill three important criteria required by the WEEE Directive: they can financially reward improved design, allocate costs of historic waste proportionately (on the basis of tonnes of new products sold), and provide sufficient financial guarantees against future waste costs and liabilities. They are also relatively practical for implementation because they are based solely on cost allocation and financing. Further research and investigation would be worthwhile to test and verify this approach using real‐world data and under various scenarios.

Environmental Dimensions of Additive Manufacturing: Mapping Application Domains and Their Environmental Implications

Additive manufacturing (AM) proposes a novel paradigm for engineering design and manufacturing, which has profound economic, environmental, and security implications. The design freedom offered by this category of manufacturing processes and its ability to locally print almost each designable object will have important repercussions across society. While AM applications are progressing from rapid prototyping to the production of end-use products, the environmental dimensions and related impacts of these evolving manufacturing processes have yet to be extensively examined. Only limited quantitative data are available on how AM manufactured products compare to conventionally manufactured ones in terms of energy and material consumption, transportation costs, pollution and waste, health and safety issues, as well as other environmental impacts over their full lifetime. Reported research indicates that the specific energy of current AM systems is 1 to 2 orders of magnitude higher compared to that of conventional manufacturing processes. However, only part of the AM process taxonomy is yet documented in terms of its environmental performance, and most life cycle inventory (LCI) efforts mainly focus on energy consumption. From an environmental perspective, AM manufactured parts can be beneficial for very small batches, or in cases where AM-based redesigns offer substantial functional advantages during the product use phase (e.g., lightweight part designs and part remanufacturing). Important pending research questions include the LCI of AM feedstock production, supply-chain consequences, and health and safety issues relating to AM.