Over 600 solar troughs, which act like giant mirrors [Getty Images]

Over 600 solar troughs, which act like giant mirrors, redirect the sun's rays to a central tower which heats water to generate steam to power turbines, at the Abengoa solar-thermal plant near Seville, Spain, on Monday, April 28, 2008. Spain has turned itself into the world's biggest builder of solar-energy plants, attracting developers from France and the U.S. by guaranteeing prices that weigh down Spanish consumers. (Photo by Markel Redondo/Bloomberg News via Getty Images)

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