... grown for biofuels are the most land- and water inten-sive of the renewable energy sources. In 2005, about 12% of the nation’s corn crop(covering 11 million acres (45,000 km2) of farmland) ... of the original energy consumed by the cow. Wood was the main source of energy in the UnitedStates and the rest of the world until the mid-1800s, and biomass continues to be amajor source of ... huge impacts on water resources and is implicated in the disloca-tion of local communities. Proponents of biofuels, however, point out that while theproduction of biofuels does require space,...