With petroleum-based fuels contributing to climate change, advocates have backed plant-based biofuels as a greener source of energy. A 2007 law requires gasoline makers to add increasing amounts of the biofuel ethanol to the U.S. fuel supply. Home-grown ethanol has also been billed as providing American jobs and more energy independence. But some regulators are now proposing a reduction in the ethanol requirement. VOA’s Steve Baragona looks at why, and what it could mean for food, fuel and the environment.