Definition of the Subject
Raw materials scarcity , rising raw materials extraction costs, and biodiversity loss are apparent globally. Recycling of materials is cited as one solution to those problems. However, maintaining the consistent quality of materials is excluded from most traditional sustainability assessments, and current regimes of carbon, emissions, and energy trading are not well designed to account for the quality or value of materials, or the processes for achieving materials recovery and reuse.
The building industry is a large consumer of scarce resources, and because of this, it is regarded as a leading cause of resource depletion. However, at the same time, materials contained in and moving through buildings have been extensively evaluated for their recovery potential [2], and as a result, could be used in a new model where buildings are resource repleters instead of depleters. Materials repletion is a value-based business model that defines new dimensions of quality...
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Abbreviations
- Term:
-
Improving the approach to materials and products sometimes requires revising traditional terminology. In the approach described here, usage of certain terms differs from traditional definitions, to account for innovative features of materials and products.
- Biobased vs. biodegradable:
-
Many biobased products such as, for example, biopolymers are not necessarily safely biodegradable because they contain additives such as heavy metals or are combined with nonbiodegradable materials. As well, petroleum-based products that are not biobased can be biodegradable. So it is important to distinguish these features to develop an effective defined-use pathway for materials. Especially, it is important to evaluate biobased and biodegradable in the context of the intended use of the material, e.g., if it is intended for a biosphere or technosphere pathway. For example, many materials designed for single use before disposal in a biosphere pathway and defined as biodegradable, such as cups, do not biodegrade in the processing time frame used in an industrial composting facility and, as a result, end up being incompletely decomposed and incinerated, or degrade the quality of compost. Because of this, the definition of “biodegradable” includes that the material is shown to degrade completely in an industrial composting facility within a prescribed time frame.
- Counter-footprint:
-
Calculation showing activities that can be used to counterbalance a negative “environmental footprint.” Example, producing renewable energy instead of just consuming energy. Counter-footprinting is still at an early stage and often, for example, does not calculate defined material content, defined-use pathways, or beneficial functions of materials such as, for example, cleaning the air. For example, Coto-Millan et al. [1] list construction materials as resource consumption, but not as a material resource on the counter-footprint side of the equation. The part of land “consumed” for structures is regarded only on the negative side of the footprint equation, rather than as a productive contributor to the ecology. In general, when materials are used for constructing a building, their impacts are frequently still considered only on the negative side of the environmental footprint and no longer considered as beneficial resources. See also “offset.”
- Cradle to Cradle®:
-
An innovation platform to improve the beneficial qualities of products and services in biosphere and technosphere metabolisms as a step beyond the traditional sustainability approach of reducing negative impacts. The term Cradle to Cradle ® is a registered mark for quality assurance purposes, similar to how the broadly accepted International Standards Organization governs use of its marks and standards. However, the philosophy, principles, and many application tools of the Cradle to Cradle® approach are widely published. The founders of the C2C approach encourage governments, companies, and NGOs to use the philosophy and principles. The right to use the Cradle to Cradle Design Protocol® for certification is assigned to an independent nonprofit organization, and certification criteria are also broadly published.
- Defined use:
-
Materials and products that are designed according to their intended use in biosphere or technosphere metabolisms.
- Depletion:
-
Loss of nonrenewable resources and destruction of renewable resources.
- Ecological footprint:
-
Usually a calculation of negative environmental impacts of human activity. Many definitions are used, but an example in relation to the built environment is “Corporate ecological footprint is defined as the environmental impact (in hectares) of any organisation, caused by: (a) the purchase of any kind of product and service clearly reflected in their financial accounts; (b) the sale of products deriving from the primary production of food and other forestry or biotic resources, or in other words when vegetables, fruit and meat enter the market chain for the first time; (c) occupation of space; and (d) generation of waste clearly reflected in their environmental report. Moreover, this impact measured in hectares can be transformed to obtain a result in tons of CO2 emitted (the carbon footprint)…” [1]. See also Counter-footprint and Offset.
- Intelligent materials pooling (IMP):
-
Sharing of defined material streams among partners to achieve economy of scale and accelerate the use of C2C-defined materials.
- Materials bank:
-
Database-supported pool of defined materials.
- Materials security:
-
Security of supply for strategically important materials such as rare metals or phosphate.
- Nutrient certificates:
-
Set of data describing defined characteristics of materials in products that give them value for recovery and reuse. Nutrient Certificates are a marketplace mechanism to encourage product designs, material recovery systems, and chain of possession partnerships that improve the quality, value, and security of supply for materials so they can be reused in continuous loops or closed loops or beneficially returned to biological systems. This is done by adding a new value dimension to materials quality. This new dimension is based on the suitability of materials for recovery and reuse as resources in other products and processes.
- Offset:
-
Assessment of activities that compensate for negative environmental impacts. As opposed to counter-footprints, offsets are often used to describe remotely located activities, such as growing trees in another location to replace trees lost due to development. However, counter-footprint and offsets can also overlap.
- Recycled vs. recyclable:
-
Products can be beneficial if they have defined recyclable content regardless if it is recycled or not. Defined recyclable content is an enabler for recycled content. If virgin content is not recyclable then it will pollute recycling streams, so recyclable is just as important as being recycled. Recycled content that is also recyclable at a similar level of quality is the end goal of product design for Nutrient Certificates.
- Recycling:
-
There are many definitions of recycling, but for these purposes, recycling is defined as recovering and reusing materials at a similar level of quality by defining their content, as compared to “downcycling” where materials are recovered and reused at a lower quality level. For example, the term “recycling” is often applied to materials such as paper, but in reality, paper is almost always downcycled due to shortening of its fibers. Many current definitions of recycled content do not define what is in the material, with the result that it is not possible to recycle the materials at a similar level of quality. The important distinguishing factor is “defined” content, which can be indicated as defined to 100 ppm.
- Repletion:
-
Replenishing the supply of biosphere and technosphere materials for use in products and processes.
- Scarcity:
-
Geographically, politically, or commercially limited supply of strategic materials.
- Upcycling:
-
Improving the existing quality of a material for its next reuse. A material can be defined as upcycled under various conditions:
-
(1)
When its current downcycling is improved so the material is recycled at a similar level of quality instead of lower level. For example, high-grade steel is separated from motors containing copper contaminants so the steel can be resmelted at the same level instead of downcycled
-
(2)
When a degraded material is repaired for effective reuse, e.g., an additive is added to a plastic to repair its damaged molecular strings so the material can be reused for a high quality purpose
-
(1)
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Acknowledgments
Portions of this article regarding criteria for the built environment are excerpted from Cradle to Cradle® Criteria for the Built Environment, Mulhall & Braungart, CEO Media 2010, Rotterdam, The Netherlands. Reprinted by permission. http://www.duurzaamgebouwd.nl/bookstore. The authors’ appreciation goes to Yael Steinberg and other EPEA scientists for their input.
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Hansen, K., Braungart, M., Mulhall, D. (2013). Resource Repletion , Role of Buildings. In: Loftness, V., Haase, D. (eds) Sustainable Built Environments. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5828-9_420
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