"While the drought is causing the current spike in food prices, prices have also been on a steady, long-term trajectory upward. So what's behind that trend? NECSI's model has fingered two key suspects: speculation and the conversion of corn to ethanol. (More on that later.) Even without the drought, Bar-Yam says, food prices were headed toward the riot zone by early next year."
http://www.npr.org/blogs/thesalt/2012/09/20/161501075/high-food-prices-forcast-more-global-riots-ahead-researchers-say
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