For 110 years, cans of Campbell's iconic condensed soup have facilitated water, energy and transportation efficiencies resulting from having cut the soups' heaviest ingredient, water, in half. Now, more than 40,000 lunchtimes later, the cans — which now feature pop-top lids and 30% recycled content — are being rewarded, along with similarly sustainable containers, for their efficiency. This month, buyers for Wal-Mart Stores began looking at the packaging scores of the company's trading ...

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