There is a lot more to this discussion on both sides. For example, many theorists think this is happening in all NATO countries.

Some documentaries have done soil testing in places like northern California to find high levels of aluminum, barium and strontium -- the chemicals the theorists believe are being sprayed.

But climatologists say an undertaking this massive would be nearly impossible to keep under wraps, even for the government.

You can find more contrail/chemtrail information at these Websites:

EPA Aircraft Contrails Factsheet:

http://www.faa.gov/regulations_policies/policy_guidance/envir_policy/media/contrails.pdf

EPA's Office of Transportation and Air Quality:

http://www.epa.gov/otaq/aviation.htm

What In The World Are They Spraying? Film:

http://www.youtube.com/watch?v=TfecFeaaxSY

Why In The World Are They Spraying? Film:

http://www.youtube.com/watch?v=mEfJO0-cTis