U.S. policy to expand the production of biofuel for domestic energy use has significant implications for agriculture and resource use. While ongoing research and development investment may radically alter the way biofuel is produced in the future, for now, corn-based ethanol continues to account for most biofuel production. As corn ethanol production increases, so does the production of corn. The effect on agricultural commodity markets has been national, but commodity production adjustments, and resulting environmental consequences, vary across regions. Changes in the crop sector have also affected the cost of feed for livestock producers. As the Nation demands more biofuel production, and markets for new biofuel feedstocks, such as crop residues emerge, the agricultural landscape will be further transformed. This book explores the changes and expanding usage of ethanol and corn biofuels.