Guardian: Two years ago the UN’s Food and Agriculture Organisation expected biofuels to help eradicate hunger and poverty for up to two billion people. Yesterday the UN secretary general, Ban Ki-moon raised real doubt over that policy amid signs that the world was facing its worst food crisis in a generation. Since the FAO’s report in April 2006 tens of thousands of farmers have switched from food to fuel production to reduce US dependence on foreign oil. Spurred by generous subsidies and an …