From Truemors:
http://uk.reuters.com/article/reutersEdge/idUKADD54111920071005
We already know that biofuel, while helping us reduce oil imports,
isn?t exactly green. Now scientists are pointing out that it isn?t
truly sustainable either. There simply isn?t enough land or fresh
water on earth to convert to fuel production. Even the small
increases in biofuel production of last year have caused food prices
to increase dramatically.