Wal-Mart Stores Inc., the world's largest retailer, says it wants its suppliers to reduce 20 million metric tons of greenhouse gas emissions by the end of 2015.
Wal-Mart says it won't force suppliers to make changes but will work with them on projects that will reduce both emissions and costs.
Its massive size gives it tremendous influence among makers of all kinds of products — muscle that gives its efforts a chance for wider adoption that other retailers might not have.
The company is working with the Environmental Defense Fund and other experts who will help measure reductions.
Last July, Wal-Mart unveiled a plan to develop eco-ratings for products it sells.
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