"A series of spikes in global food prices resulted in riots in 2008 and contributed to violent uprisings in North Africa and the Middle East in 2011. The culprit is a matter of considerable and frequently heated debate, but the most commonly cited candidates include market speculators, global warming and aggressive government renewable fuel mandates."
http://www.forbes.com/sites/williampentland/2012/07/28/the-coming-food-crisis-blame-ethanol/
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