Are you worried about chemtrails?

China used weather manipulation to try to cut the pollution out of the air for the Olympic games.

The technology is there. There are private companies even that offer to attempt to manipulate the weather for particular events. I doubt the material is present in normal contrails though. I think it's some kind of aluminum oxide dust that acts as nucleation points for the water.. But I don't really know.

http://www.youtube.com/watch?v=Psdg3OAw_a8&feature=related

>>4
I believe in it. About two years ago, I had a plane pass by spraying stuff and after I'd say 45 minutes I went into my back yard to check and in some areas there was this milky substance on some parts of the lawn. I then got a mason jar and some gloves and collected as much of it as I could and I told someone from a local lab about it. He said to bring it in to have it analyzed, and it turned out it contained some heavy metals and some pesticides that are used on large factory farms to keep crops clean and bug free.

Of course this is just an anecdotal story from me, but I certainly believe that planes do spray some crap over people's homes. I don't know if it's the government doing it or just corrupt corporations trying to secretly get rid of their toxic crap. Whether or not it's being done deliberately is another story altogether.