Gentlemen
It may be that aircraft are the only thing stopping the the whole weather thing from going into meltdown.
A scientist noticed that after the tragedy of the 11th September 2001, the weather across nearly the whole of the continental USA was clearer and warmer than normal.
This piqued his interest and he obtained the weather records from across the country which confirmed his suspicion. The only thing he could put it down to was that as nearly all aircraft had been grounded the sky was clear of the usual collection of contrails.
This has led a number of scientists to investigate further and they have come to the conclusion that the environmental measures that are being put in place (motor vehicle emission controls etc.) are making the atmosphere clearer but not reducing the real problem. As a result, more of the suns heat is now reaching the earth and making the whole shooting match much warmer.
More contrails I say.
