>Hi,
>Looks like they are broadly speaking comarable. This claims to show the general picture:
>http://www.grida.no/publications/other/ipcc%5Fsr/?src=/climate/ipcc/aviation/125.htm
>(but it doesn't appear to add weighting to the additional problems of CO2 at high altitude)
>One transatlantic round trip would probably churn out more CO2 per head than most people generate from a year of car use....

What about the military planes? They are probably the least fuel efficient, they don't serve any useful purpose (other than to take the pilot out for a ride and bring him back), plus they serve a few very damaging purposes - like destruction of other goods or bads, which will then have to be remade, using more resources.

I'm just deurinated for not being able to hear what I say several times a day. They fly over our heads, very low. Ooops, they must be ships, as they belong to the navy.