Associated Press
FILE - In this Tuesday, Feb. 1, 2000 file photo, a  meteorologist uses the Northwest Airlines' Turbulence Plot System software, to track areas of turbulent air over the Pacific   at the System Operations Center in Minneapolis. More pollution is likely to mean bumpier flights for trans-Atlantic travelers, researchers say in a report published Monday April 8 2013, predicting increased turbulence over the north Atlantic as carbon dioxide levels rise.  (AP Photo/Dawn Villella, File)

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