WASHINGTON — After implementing chainwide the suggestion of a store associate to unplug the light source of its break room vending machines, Wal-Mart saved over $1 million in related energy costs, according to Matt Kistler, senior vice president of sustainability for Wal-Mart Stores. "Wal-Mart doesn't consider itself a green company but we are doing great things and making progress in the area of sustainability," he told attendees during the Grocery Manufacturers Association's Sustainability ...

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