What about Peak Oil ?
Peak Oil is the theory that we are almost at the point where supply won't keep up with demand.
This may sound like good news to environmentalists, but using tar sands and shale oil will release many times the pollution in mining and refining. Coal liquifaction is also being mentioned. Another very dirty fuel. And they will be developed--if not here, elsewhere.
All the studies I've seen say ethanol can't even come close to matching demand. Even if plants were scaled up immediately there wouldn't be enough corn to fill 20 percent of the demand.
No one seems to have joined the debate...