The real flaw in the Clean Air Act's Renewable Fuel Standard (RFS) is mandating particular volumes of fuel use each year rather than specifying a share of the total fuel market. RFS Clouds Under the Renewable Fuel Standard (RFS) in the Clean Air Act, U.S. EPA gains substantially more flexibility to set future biofuel use levels if it has waived at least 20 percent of the statutory use level for two years in a row by 2016. Congress wrote this "off ramp" out of recognition that technology and the market might not be able to achieve the lofty political goals it originally set. Not coincidentally, the EPA has proposed cutting the RFS by 20.5 percent in 2015 and 21.8 percent in 2016. The ethanol industry sees this as both intentional and...