Tom Uhlman
In this April 4, 2010 photo, a sign advertising earth friendly products hangs at the end of an isle at a Cincinnati area Wal-Mart. Retailer Wal-Mart Stores Inc. is urging its suppliers to reduce 20 million metric tons of greenhouse gas emissions by the end of 2015, on top of its own moves to build more energy-efficient stores, using more alternative fuels for its truck fleet, and reduce packaging. (AP Photo/Tom Uhlman)
