I recall hearing (speaking of the how much we put in) that for the few days after 9/11 when all flights were grounded, scientists measured (atmospheric temprature? not sure) and found that with planes downed, the temprature actually rose.
As I recall it explained to me in my evironmental science courses, its because air travel creates a thick layer of something or other (I'm tempted to just say smog) that actually blocks much of the natural sun that should come to earth.
This was like 5 years ago, and I jsut got to work on a saturday but I'm hoping Tore can translate that into english (as so many of the ESLers do for me here).
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