If you don't "believe", look it up. The government recently announced that the military can now/soon do "legal" weather modification experiments. They already did throughout the 70s-2000.

German scientists just proved their military has been doing it to them. Local US news stations are investigating and discovering barium, aluminum and other toxins are being sprayed over their cities. Las Vegas is one of the frequent targets. Here is footage I captured from over a couple hours around midday on Feb. 27, 2008.

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Local news station confirms barium in chemtrails- http://youtube.com/watch?v=okB-489l6MI

NBC News: Chemtrails over California- http://youtube.com/watch?v=iIAWWL4HQDg

Alex Jones: Chemtrail Spraying is Real & Documented-
http://youtube.com/watch?v=e2DAWWugFd4

US Secretly testing on Americans again?- http://youtube.com/watch?v=PVZAChMUa0Y