CO2 and 747s

From:         rleigh@laurel.ocs.mq.edu.au (Roy Leigh)
Organization: Macquarie University
Date:         22 Nov 94 00:42:58 
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do commercial airliners have a significant effect on the enhanced greenhouse
effect? How much (kg) CO2 and hydrocarbons does a 747 produce while cruising? I
assume it is insignificant but can't find any evidence.

Thanks

Roy