Ethanol production in the United States totalled almost 5 billion gallons in 2006, about 1 billion gallons more than in 2005. While this was a significant increase, further expansion in the industry is continuing, with production expected to exceed 10 billion gallons by 2009. This large and rapid expansion of U.S. ethanol production affects virtually every aspect of the field crops sector, ranging from domestic demand and exports to prices and the allocation of acreage among crops. Many aspects of the livestock sector are affected too. As a consequence of these commodity market impacts, farm income, government payments, and food prices also change. This book examines the economics of ethanol production and its impact on food prices and greenhouse gas emissions.