This is occurring as a number of anti-ethanol groups have again raised the issue of GHG emissions. One of the most strident is the Environmental Working Group, which contends that the decrease in such emissions from ethanol used by EPA is overstated.U.S. EPA’s Office of Inspector General (OIG) announced via memo on 15 October that it will review the management of the Renewable Fuel Standard (RFS) to determine if the agency:

Complied with the reporting requirements of laws authorizing the RFS Updated the life-cycle analysis supporting the RFS with findings from the statutorily-mandated National Academy of Sciences 2011 study on biofuels, the EPA’s 2011 Report to Congress on the Environmental Impacts of Biofuels and any subsequent reports...