So not often we get to the point of understanding why some things just are... well here is a chance to get educated.
I am afraid that while I am very concerned about the environment there is so much of the reasoning and science that I dont understand. However that does not deter me from trying to figure out the why and how of Greenhouse Gas effect and the long term effects of aviation on the environment.
So here is a VERY geeky piece by a bunch of MIT wonks
If you can figure out this stuff then you are a better person than I - but its worth making the effort