Photo 2 Dec Washington, DC, USA - December 2, 2011: Pres. Barack Obama announces a $4 billion effort to increase the energy efficiency of government and other private sector buildings at a retrofit construction site at 815 Connecticute Ave.   Photo by Ian Wagreich / © U.S. Chamber of Commerce

Washington, DC, USA - December 2, 2011: Pres. Barack Obama announces a $4 billion effort to increase the energy efficiency of government and other private sector buildings at a retrofit construction site at 815 Connecticute Ave.   Photo by Ian Wagreich / © U.S. Chamber of Commerce


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