Corn-derived ethanol is liquid evil. The production of ethanol consumes 29% more energy than it produces, it drives up the prices of corn products for the poor, and it dumps more CO2 into the atmosphere than gasoline when you take production into account.

http://science-community.sciam.com/blog-entry/Sciam-Observations/Corn-Kind-Worst-Thing/300004380

http://www.grist.org/comments/food/2006/12/13/fuel_vs_food/