There is widespread agreement among experts, policy makers and the public that the United States must overcome its addiction to fossil fuels to protect the environment and for reasons of national security. As in any addiction, interventions are necessary to break bad habits. Fortunately, in 2007 Congress expanded the Renewable Fuel Standard (RFS), requiring increased production and use of renewable fuels from multiple sources. American companies are making steady progress in creating advanced plant-based fuels. But this progress could be threatened by political uncertainty about continuing the RFS mandate.