Here's the IPCC's take: http://www.ipcc.ch/ipccreports/sres/aviation/index.php?idp=64 http://www.ipcc.ch/ipccreports/sres/aviation/index.php?idp=6... One inter

Here's the IPCC's take: http://www.ipcc.ch/ipccreports/sres/aviation/index.php?idp=64 http://www.ipcc.ch/ipccreports/sres/aviation/index.php?idp=6... One interesting aspect is that for high altitude airplanes, water vapour emissions may be as problematic as CO2.