Rioting in response to soaring food prices recently has broken out in Egypt, Cameroon, Ivory Coast, Senegal and Ethiopia. In Pakistan and Thailand, army troops have been deployed to deter food theft from fields and warehouses. World Bank President Robert Zoellick warned in a recent speech that 33 countries are at risk of social upheaval because of rising food prices. Those could include Indonesia, Yemen, Ghana, Uzbekistan and the Philippines. In countries where buying food requires half to three-quarters of a poor person's income, "there is no margin for survival," he said.

Many policy makers at the weekend meetings of the International Monetary Fund and World Bank agreed that the problem is severe. Among other targets, they singled out U.S. policies pushing corn-based ethanol and other biofuels as deepening the woes.

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