Urgent action to help the world's poorest farmers help themselves would make a significant contribution to tackling the global food crisis in a single growing season, according to Jeffrey Sachs, United Nations development adviser. "In much of the poorest parts of the world, the potential for significant increases in food production is very real," said Mr Sachs, director of the Earth Institute at Columbia University and adviser to Ban Ki-moon, the UN secretary-general.

Food scientists are meeting in Cusco, Peru, this week to find ways of boosting world potato production to ease the strain of surging cereal prices on the world's poorest countries. Potato production already reached a record high last year as cereal prices rose, partly as a consequence of grain producers - such as the US - switching to bio-fuel crops. The impact of more expensive cereals has been harshest on developing countries that are dependent on imports.