...Thus the entire U.S. corn crop would supply only 3.7 percent of our auto and truck transport demands. Using the entire 300 million acres of U.S. cropland for corn-based ethanol production would meet about 15 percent of the demand.For good measure, they add a moral component to their argument:
Finally, considering projected population growth in the United States and the world, the humanitarian policy would be to maintain cropland for growing food -- not fuel. Every day more than 16,000 children die from hunger-related causes -- one child every five seconds. The situation will only get worse. It would be morally wrong to divert cropland needed for human food supply to powering automobiles. It would also deplete soil fertility and the long-term capability to maintain food production. We would destroy the farmland that our grandchildren and their grandchildren will need to live.These arguments from general energy principles would seem to dominate over enthusiasm for ethanol, as was highlighted in today's Boston Globe. Although this article primarily discussed cellulosic ethanol, not corn ethanol.