Even evil WalMart gets in on commercial efficiency/solar.

At Tuesday's announcement, Wal-Mart's CEO Lee Scott put energy efficiency and renewable energy at the center of its environmental plan. The company's aim, he says, is to get 100 percent of its energy from renewable sources; cut energy use in stores by 30 percent, cut fuel consumption in its truck fleet by 25 percent over three years - and continue to improve, doubling mileage over a decade.

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The US Green Building Council in 2000 set standards for gauging the environmental impact of buildings - including energy use. Five years later more than 2,000 commercial projects representing about 5 percent (about 230 million square feet) of America's commercial building stock have applied for the Leadership in Energy and Environmental Design or LEED standard, an environmental design standard that includes energy efficiency ratings.

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"If Wal-Mart was a city, they'd be No. 5 in country, so the company's leadership is very important," says Amory Lovins, who heads the Rocky Mountain Institute, an energy think tank in Snowmass, Colo. "If they help introduce similar efficiencies and green practices throughout their supply chain, it could have a huge effect."