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Published November 13, 2013, 12:00 AM

Ethanol plant

In this photo taken July 20, 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." (AP Photo/Charlie Riedel)