Of late there has been a lot of criticism of bio-ethanol as a fuel, especially that derived from what would otherwise be used as food crops. But this article from Business Week questions a few of the criticisms, and points out that the rush, at least in the USA, to produce ethanol from corn (we still call it maize on our side of the pond), has not contributed as much to the increasing cost of corn than is assumed.
A thought provoking article that is well worth a perusal.