Don't need fields bud, we can grow just as much food using spaces on rooftops in cities if done aeroponically. Sure the initial costs are greater, but after we get things swinging into mass production such as the nutrient solutions the costs would go down.
Even then, ethanol would not be able to supply the nation with enough energy. A study done by people at the University of Minnesota found that even if every acre of corn was devoted to ethanol, less than 13% of the nation's gasoline demand would be met. Even if roof-tops were included, the nation would face massive shortages
http://www.pnas.org/content/103/30/11206.full
The switch over to ethanol would be extremely expensive, especially to lower income families.
Not only that, but the machines that process ethanol run off of gasoline. The harvest uses gasoline, the transportation uses gasoline/diesel, the machines use gasoline. On top of all of that, ethanol still pollutes the environment.
I'm all for alternative energy sources, but I see ethanol as a dead end resource. I feel that time and money are better spent some place else. Interestingly enough, my Calc teacher in high school modified his car to run off of fry oil. Restaurants give him their used oil for free. Normally they'd have to pay for it to be removed, but both the restaurant and the consumer save money. Granted, I have no idea how it is for the environment.
**as for the topic of the oil-spill**
I find is unimaginable how devastating the consequences will be if they can't figure out a way to stop the leak. Six weeks and it's still spewing oil. Hooray humans! My prediction, BP will be out of business.
Also, does anyone find it questionable that oil prices haven't risen noticeably (at least in my area) since the spill, but they sky rocketed before Katrina? Of course, I don't know much about the economics behind it, but it does strike me as odd.