Green building is roaring even as the rest of the economy suffers, according to a report from McGraw-Hill Construction. Eco-friendly and energy-efficient projects now account for 25% of all construction in the U.S., the report found, with the market for green building growing 50% in the past two years to reach $71 billion. The report predicts that the green-building market will be worth $135 billion by 2015.

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