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The world is experiencing a food crisis like it's never seen before. Over the past three years food prices have doubled. Now, as the price of wheat and rice soar, some nations have halted exports.

The World Food Program, the world's largest humanitarian agency, released last month an alert, or "extraordinary emergency appeal," for $500 million, saying the money is needed by May 1 to avoid cutting rations to some of the world's most impoverished regions.

World's food crisis deepens