Spiraling food prices and shortages have sparked riots in Latin America, Africa and Asia. And even in the worlds richest nation, some U.S. retailers are rationing rice. The causes - rising demand, bad weather, and the increasing use of corn for fuel. The mounting global crisis has prompted intergovernmental agencies to take action. After Indonesia and India tried to curb rice exports and Egypt banned shipments altogether, the World Bank is urging food-producing nations not to ban exports. The United Nations is setting up a food task force. Secretary-General Ban Ki-moon has urged nations to fund $755 million in emergency food aid. (SOUNDBITE)(English) U.N. SECRETARY-GENERAL BAN KI-MOON, SAYING: Without full funding of these emergency requirements, we risk again the specter of widespread hunger, malnutrition and social unrest on an unprecedented scale." Taking a large share of the blame: biofuels that use corn to help power the worlds cars and trucks. The UNs special...