Improving a product, a service, a system with respect to their environmental impact. If efficiency is measuring by the amount of material, energy, labour or money required to produce something, eco-efficiency is the amount of environmental impact required to produce that thing. In both cases, the objective is to maximize the formula OUTPUT/INPUT i.e [products]/$$ or [products]/[GHG emission]. The limit of the concept of eco-efficiency is that it will still produce waste, toxics, air pollution or depletion although in smaller quantities. Bill McDonough and Michael Braungart want us to consider instead the concept of eco-effectiveness (see this term)
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