If you’ve pumped gas at a U.S. service station over the past decade, you’ve put biofuel in your tank. Thanks to the federal Renewable Fuel Standard, or RFS, almost all gasoline sold in the U.S. is required to contain 10 per cent ethanol – a fuel made from plant sources, mainly corn. With the recent

Comment: U.S. biofuel mandate helps farmers, but does little else
Research shows it does little for energy security and harms the environment