FILE - In this Aug. 16, 2012 file photo, drought-damaged corn is 

FILE - In this Aug. 16, 2012 file photo, drought-damaged corn is seen in a field near Nickerson, Neb. A new federal science report looking at last year's Midwestern drought says it was a freak of nature that wasn't caused by man-made global warming. The 50-page drought task force report written by dozens of scientists from five different federal agencies looked into why forecasters didn't see the more than $12 billion drought coming. The researchers concluded that it was so unusual and unpredictable that it couldn't have been forecast. (AP Photo/Nati Harnik, File)
Associated Press
FILE - In this Aug. 16, 2012 file photo, drought-damaged corn is seen in a field near Nickerson, Neb. A new federal science report looking at last year's Midwestern drought says it was a freak of nature that wasn't caused by man-made global warming. The 50-page drought task force report written by dozens of scientists from five different federal agencies looked into why forecasters didn't see the more than $12 billion drought coming. The researchers concluded that it was so unusual and unpredictable that it couldn't have been forecast. (AP Photo/Nati Harnik, File)
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