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US crop yields could wilt in heat http://apocadocs.com/s.pl?1251202164
Yields of three of the most important crops produced in the United States -- corn, soybeans and cotton -- are predicted to fall off a cliff if temperatures rise due to climate change.... The study shows that crop yields tick up gradually between roughly 10 and 30 degrees Celsius, or about 50 to 86 degrees Farenheit. But when temperature levels go over 29 degrees Celsius (84.2 degrees Farenheit) for corn, 30 degrees Celsius (86 degrees Farenheit) for soybeans and 32 degrees Celsius (89.6 degrees Farenheit) for cotton, yields fall steeply. "While crop yields depend on a variety of factors, extreme heat is the best predictor of yields," Roberts says. "There hasn't been much research on what happens to crop yields over certain temperature thresholds, but this study shows that temperature extremes are not good."
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