Forbes

This year American motorists will burn through 14 billion gallons of ethanol, the end product of 5 billion bushels of corn—a third of the U.S. crop—grown on 33 million acres of farmland. It arguably cuts pollution coming out of U.S. tailpipes, but at a huge cost. Since 2005, when Congress required that ethanol be added to your gas tank, U.S. corn prices have tripled.