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Secret Service agents follow President Barack Obama as he tours solar panels at Nellis Air Force Base in Las Vegas, Nevada.   Nellis has the  largest solar installation in the entire Western Hemisphere.   More than 72,000 solar panels provide 25 percent of the electricity for the 12,000 people who live and work at Nellis.Photo by Brooks Kraft/Corbis

Secret Service agents follow President Barack Obama as he tours solar panels at Nellis Air Force Base in Las Vegas, Nevada. Nellis has the largest solar installation in the entire Western Hemisphere. More than 72,000 solar panels provide 25 percent of the electricity for the 12,000 people who live and work at Nellis.

Photo by Brooks Kraft/Corbis