There's more on biofuels and food in this interesting piece by John Vidal in the Guardian last Wednesday. Amongst other things he says
In the US, where nearly 40 million people are below the official poverty line, the Department of Agriculture recently predicted a 10% rise in the price of chicken. The prices of bread, beef, eggs and milk rose 7.5 % in July, the highest monthly rise in 25 years.
"The competition for grain between the world's 800 million motorists, who want to maintain their mobility, and its two billion poorest people, who are simply trying to survive, is emerging as an epic issue," says Lester Brown, president of the Washington-based Worldwatch Institute thinktank, and author of the book Who Will Feed China?
I could have written it myself, but I'm intrinsically too optimistic.