In this photo taken Saturday, July 20, 2013, an ethanol plant stands next to a cornfield near Nevada, Iowa. When President George W. Bush signed a law in 2007 requiring oil companies to add billions of gallons of ethanol to their gasoline each year, he predicted it would make the country "stronger, cleaner and more secure." But the ethanol era has proven far more damaging to the environment than politicians predicted and much worse than the government admits today. Government mandates to increase ethanol production have helped drive up corn prices leading to marginal land being farmed to produce the crop. (AP Photo/Charlie Riedel)CORYDON, Iowa (AP) — The hills of southern Iowa endure the scars of The us's push for green power: The brown gashes where rain has washed away the soil. The polluted streams that dump fertilizer into the water supply.

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