Today President Obama is speaking about clean energy and energy efficiency at a Walmart in Mountain View, Calif. Of all the places he might give a big speech on energy, a Walmart supercenter is a baffling and disconcerting choice. Walmart — despite its skill in attracting publicity like this — is a laggard on renewable energy and one of the biggest and fastest-growing climate polluters on the planet. While many competing retailers are already running on 100 percent renewable power, Walmart's wind and solar projects supply just 3 percent of its U.S. electricity — and that's down from 4 percent two …
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