No, Virginia. Cosmic rays don't cause global warming.

[K4PIH]

You are right, you can't tell those people anything because it would destroy the community of crack pots they belong to. I spent a lot of time around and in aircraft in 22 years of service and I never saw anyone adding "chemicals" to the fuel, never read any documentation that said it was occuring, and believe me I had access to everything. To believe in chemtrails is to believe that we were doing it to our enemies back in WWII. Yes it infurates me to even read about chemtrails and other stuff because it brings ridicule to any serious scientific study.

I first heard about the Chemtrail conspiracy theory back around 1990, before the Internet was very popular and when most who had it were on slow dialup. As the Internet took shape I started hearing more and more about chemtrails. So, I decided to take a completely unbiased look at the "phenomenon". I started reading the claims made by chemtrails believers, I read the various theories they had for why chemtrails are being done, how they are being created, etc. One of the first things I noticed was a lack of any scientific research and mostly anecdotal stories, hunches, etc. But it got worst, the more I read into the conspiracy theory the less and less plausible it became. It simply makes no sense no matter how you look at it. I finally decided chemtrails are bullshit. What these people are seeing are normal aircraft contrails. They are comprised of tiny droplets of water or tiny cystals of ice. But don't tell them I said that :)