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

Pesticides are routinely sprayed over residential areas. All the fucking time. There are many serious pests that cause billions in damages to crops and homes that need to be controlled. There is generally plenty of warning of what pesticides will be used and when, but most people are ignorant as to where to go to find this information. Not that it really matters. The stuff is harmless.

In the southern United States, it is common to see trucks spraying in residential areas (even around children) for mosquitoes. The chemicals are completely safe for humans and animals unless you put the hose in your mouth and drink a gallon of it. Then you'll probably vomit, but you'll survive. People love the truck spraying crews (due to media exposure of Malaria and West Nile outbreaks in the weeks prior). Why is it suddenly so fucking scary when a plane is used to vastly increase efficiency and reduce costs?

You're a fucking idiot, that's why. People like you and the OP are nothing more than ignorant, delusional retards too busy spinning grandiose fantasies to do any amount of honest research or critical thinking.