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This is a big knot to untangle: Sustainability metrics for consumer products (WSJ.com)

Milk is among the first products that Wal-Mart Stores Inc. is trying to measure as part of a broad effort by the retailer to assess the environmental impact of the products its sells. It intends to begin labeling certain products with a “sustainability” score — a single number that would take into account not only carbon emissions, but also water use and waste production. That is doubly complicated because it involves weighing the relative importance of different kinds of environmental impact. Which is worse: that a tomato uses lots of water or lots of pesticide?
via online.wsj.com

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