Just saw this article on Yahoo. Very promising. Perhaps if we find the right crop to use, something that grows in the US most of the year and does not harm the land, we'll be golden.
"The study refined results from several previous studies by comparing the total energy that goes into making ethanol gas from corn, such as harvesting and refining, and comparing it to the energy needed to produce gasoline from fossil fuels. Kammen's team looked into levels of greenhouse gases produced by both the production and the use of each fuel."
http://news.yahoo.com/...