FILE - In this July 5, 2012 file photo, a dock extends 

FILE - In this July 5, 2012 file photo, a dock extends into a dry cove at Morse Reservoir in Noblesville, Ind., as oppressive heat and drought conditions stifle the middle of the United States. In 2012 many of the warnings scientists have made about global warming went from dry studies in scientific journals to real-life experience. One example: July was the hottest month in record-keeping U.S. history. (AP Photo/Michael Conroy, File)
Associated Press
FILE - In this July 5, 2012 file photo, a dock extends into a dry cove at Morse Reservoir in Noblesville, Ind., as oppressive heat and drought conditions stifle the middle of the United States. In 2012 many of the warnings scientists have made about global warming went from dry studies in scientific journals to real-life experience. One example: July was the hottest month in record-keeping U.S. history. (AP Photo/Michael Conroy, File)
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