FILE - A man watches as a British Airways plane lands at London's Heathrow Airport, in this Monday Jan. 10, 2011 photo. More pollution is likely to mean bumpier flights for trans-Atlantic travelers, researchers say, predicting increased turbulence over the north Atlantic as carbon dioxide levels rise. (AP Photo/Lefteris Pitarakis, file)

Associated Press
FILE - A man watches as a British Airways plane lands at London's Heathrow Airport, in this Monday Jan. 10, 2011 photo. More pollution is likely to mean bumpier flights for trans-Atlantic travelers, researchers say, predicting increased turbulence over the north Atlantic as carbon dioxide levels rise.  (AP Photo/Lefteris Pitarakis, file)
FILE - A man watches as a British Airways plane lands at London's Heathrow Airport, in this Monday Jan. 10, 2011 photo. More pollution is likely to mean bumpier flights for trans-Atlantic travelers, researchers say, predicting increased turbulence over the north Atlantic as carbon dioxide levels rise. (AP Photo/Lefteris Pitarakis, file)
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