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Polyurethane

It's used as foam insulation, upholstery stuffing, shiny wood-floor sealant, and more. This synthetic polymer is strong, lightweight, and versatile. It is highly effective as an insulator, which earns it green points, though it is obviously not eco-friendly from a resource standpoint, since it's petroleum-based. Polyurethane foam insulation was traditionally blown in with CFCs or HCFCs, which are known ozone depleters. Today, more eco-friendly blowing agents are used with this material, and it's a component of structural insulated panels (SIPs), a construction element that is generally smiled upon by green builders.

 

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The manufacture of nearly everything produces waste, some of it hazardous waste, and some of it merely taking up space and polluting the environment-everything from scrap metal to water tainted with chemicals. In the United States alone, we generate nearly eight billion tons of industrial waste every year; the Environmental Protection Agency (EPA) reports that 97 percent of that is in wastewaters. Efforts to reduce this number involve diverting materials for reuse and recycling, and creating more efficient manufacturing methods that reduce the waste generated.
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