Global warming to hurt corn for decades, says professor

http://wlds.com/index.php?option=com_content&view=article&id=9959:global-warming-to-hurt-corn-for-decades-says-professor&catid=56:local-news&Itemid=127
Diffenbaugh says research indicates over that time period, volatility in corn yields could intensify due to climate changes. He says that would ought-weigh the impacts of oil prices and biofuels mandates on the price of America's top crop.