In addition to greening store operations, retailers are also searching for ways to make their supply chains more sustainable, says Cheryl Bynum, director of the Environmental Protection Agency's SmartWay program, which helps retailers calculate and manage the carbon footprints generated by their supply chains and choose the greenest carriers for their goods. The program has helped eliminate 28 million metric tons of carbon dioxide, saved 65 million barrels of oil and cut $8.1 billion in fuel costs, according to EPA data.

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