Global warming is substantially cutting potential crop yields in some countries — to such an extent that it may even cause food price increases. Wheat yields in recent years were down by more than 10 percent in Russia and by a few percentage points each in India, France and China and Corn yields were down a few percentage points in China, Brazil and France. Some countries saw small gains from the temperature increases, however as the extra carbon dioxide that humans are pumping into the air acted as a fertilizer that encouraged plant growth. But still, the losses in some countries outweigh the gains in others.
http://www.nytimes.com/2011/05/06/science/earth/06warming.html?partner=rss&emc=rss
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