A worker stands next to an array of Sharp solar cell modules at a power plant south of Tokyo in August. Sharp was one of 1,400 solar panel manufacturers in attendance at the Solar Power International conference, where industry optimism was high.

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In times of drought, the Twin Oaks Aquifer Storage and Recovery Facility pumps water up from underground and sends it back to San Antonio for use. The facility uses water from the Edwards Aquifer and the Carrizo Aquifer. Paul Robinson/San Antonio Water System hide caption

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Texas Gov. Rick Perry waves to the crowd after speaking at an anti-abortion rally on the Capitol steps in Austin on Jan. 23, 2010. Jack Plunkett/AP hide caption

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Mike Toomey (foreground), former chief of staff to Texas Gov. Rick Perry, watches primary election returns with other staffers in Austin in 2006. Harry Cabluck/AP hide caption

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Cattle use a tree for shade near Canadian, Texas, in late July, with temperatures rising above 100 degrees. A severe drought has caused shortages of grass, hay and water in most of Texas, forcing ranchers to thin their herds or risk losing their cattle to the drought. Scott Olson/Getty Images hide caption

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Republican presidential candidate Texas Gov. Rick Perry meets with business leaders at a lunch in Dubuque, Iowa, on Tuesday. Charles Dharapak/AP hide caption

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Texas Gov. Rick Perry speaks at the Texas Education Agency Administrators' Midwinter Conference in Austin, Texas, in 2001. Deborah Cannon/AP hide caption

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A law enforcement official stands by as Polygamist sect leader Warren Jeffs, left, arrives at the Tom Green County Courthouse on Thursday in San Angelo, Texas. Jeffs' much-anticipated Texas trial began on Thursday, with prosecutors claiming he sexually assaulted girls he manipulated into "spiritual marriage," and defense attorneys countering that their client's religious freedoms were trampled. Tony Gutierrez/AP hide caption

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