In addition to milk and other ingredients, a lot of thought has gone into Wal-Mart's Great Value all-natural sour cream. So much thought, in fact, that after close collaboration with its dairy supplier partners, Wal-Mart launched 12 sustainability initiatives estimated to save about $250 million. One of the projects involves use of a methane digester that turns manure from cows — that produce milk for the sour cream — into electricity. In addition to saving supplier Twin Birch Dairy ...

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