The document discusses the Renewable Fuel Standard (RFS) program and its evolution over time. It outlines RFS1, RFS2, and the EPA-moderated transaction system (EMTS), noting RFS2 went into effect after July 1, 2010. The primary purpose of RFS is to incentivize renewable fuel blending by allowing obligated parties to meet their renewable volume obligations through a credit system tracked using renewable identification numbers (RINs).