Thank You, Wal-Mart. We're All Green Now.

One year after Wal-Mart launched an ambitious plan to help its suppliers track their energy and materials use and carbon emissions, the effort has officially become a trend among corporate multinationals.

But don't assume that these companies are forcing change purely out of their love of the environment. A slow- or no-growth economy is another driver, since lower energy and resource costs translate into higher profits. They're going green, but mainly because they're seeing green.

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