In part, the Senators wrote: ‘The outgoing administration undermined the Renewable Fuel Standard (RFS), which was designed to reduce greenhouse gas emissions from the transportation sector, diversify our fuels, strengthen our national security and drive economic opportunity in America’s heartland. It is critical that the integrity of this policy be restored, and that biofuels be part of your efforts to combat climate change and reduce greenhouse gas emissions from the Nation’s largest emitting sector.’