Guardian: The UN secretary-general, Ban Ki-moon, yesterday called for world leaders to attend a summit in June to tackle the food price crisis that has triggered global social unrest. In the run up to the summit in Rome, a UN taskforce headed by a British diplomat, Sir John Holmes, will try to develop a coherent international response to the crisis, at a time of sharp international divisions over food exports, genetically modified crops and biofuels. The plans for a taskforce and summit were …