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        President Obama Visits Largest Photovoltaic Plant in U.S | Earth's Resources

        BOULDER CITY, NV - MARCH 21: U.S. President Barack Obama speaks at Sempra U.S. Gas & Power's Copper Mountain Solar 1 facility, the largest photovoltaic solar plant in the United States on March 21, 2012 in Boulder City, Nevada. Obama is on a four-state tour promoting his energy policies. (Photo by Ethan Miller/Getty Images)

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