The Obama administration was urged on Monday to stop diverting grain to gas amid warnings of an "imminent food crisis" caused by America's drought.
US government forecasts of a 4% rise in food prices for US consumers because of the drought have sharpened criticism of supports for producing fuel from corn-based ethanol.
Meanwhile, research published last week by the New England Complex Systems Institute warned of an "imminent food crisis" because of the diversion of corn stocks to ethanol.
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