This study assesses the value of the expensive program and its potential to meet the goal of enhancing energy security in an environmentally sustainable fashion. The policy research is designed to identify the steps necessary to avoid unintended negative impacts on sustainable development and the environment, including deleterious impacts on domestic agriculture, surface and ground water, and overall air quality in the United States. It also addresses the daunting logistical and economic challenges of expanding biofuels supplies into the U.S. fuel system and examines the costs and benefits of different options.