WASHINGTON (Reuters) - For the second time in five months, the U.S. government is being sued to overturn a law that forces oil refiners to use a scarce biofuel.
Under the federal Renewable Fuel Standard, refineries were required by the Environmental Protection Agency to use 6.6 million gallons of cellulosic biofuels - a fuel made from non-grain sources such as wood chips - in 2011.