On Tue, 11 Oct 2011 13:00:22 +0100
Roland Perry wrote:
It means that if you add up the greenhouse contributions of the
emissions it's slightly negative. Although you can probably find people
who disagree. Greenhouse politics is a bit like that. "Often in error,
but never in doubt" [of their being correct] as someone said.

Some of the contributions a SO2 reflects heat as well as the
contrails. The engines burn some atmospheric Methane, but nitrous oxides
react with it as well, so there's another reduction in greenhouse
effect.

What a load of cock. SO2 soon reacts with water and comes out of the
atmosphere of its own accord and Methane reacts with O2 eventually anyway
plus most of it is near ground level, not at 30,0000 feet.

As for contrail reflections, they reflect heat out into space but also
back down towards the earth which doesn't help at night. So once everything
everything out you're left with the 500 million tons of CO2 that
aircraft pump out each year.

Looking at growth, air transport is increasing at 4% a year globally,
but set against that there's a 2% per annum increase in fuel efficiency.

Well thats ok then, its only going up by 2% each year.

B2003