"Shoppers expect the tags on Wal-Mart items to have rock-bottom prices. In the future they may also have information about the product’s carbon footprint, the gallons of water used to create it, and the air pollution left in its wake.
As the world’s largest retailer, Wal-Mart Stores is on a mission to determine the social and environmental impact of every item it puts on its shelves. And it has recruited scholars, suppliers, and environmental groups to help it create an electronic indexing system to do that.
The idea is to create a universal rating system that scores products based on how environmentally and socially sustainable they are over the course of their lives."