Proposed ethanol cuts bring EPA up against Iowa’s powerful politician

Big square baler harvesting wheat straw for production of cellulosic ethanolFollowing years of debate, the EPA said earlier this month it will study the possibilities of cutting the amount of ethanol in the United States' gasoline supply. Since 2007, the Renewable Fuel Standard (RFS) has required growing amounts of ethanol to be blended into U.S. fuel supplies, with E10—a mix of 10 percent ethanol and 90 percent...