Wal-Mart's efforts to curb its carbon footprint and clean up its supply chain are a sign of how much the environmental movement has changed in recent years, writes Edward Humes. Businesses, rather than political pressures, are pointing the way forward for American consumers and policymakers. "Outsourced global companies like Wal-Mart can never be completely green or sustainable. But ... their realization that profit and planet can and must live on the same side of the ledger sheet puts them way ahead of most politicians and voters," Humes writes.
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