The world will face high food prices "in the years to come", the UN food summit said yesterday, but failed to agree how the crisis could be eased. The summit, hosted by the UN's Food and Agriculture Organisation, was called to tackle food price rises that have triggered riots in 30 countries, but became embroiled in a bitter dispute over biofuels and export restrictions. Agricultural commodities rose on the news as traders saw no prospect of change in biofuels policies or in the use of trade restrictions by key exporters. Bad weather has also contributed to the recent price rises.