For all those who are steadfast in their belief that chemtrails don't exist and who also say there is no evidence of such activity, go to the following site for U.S. Patents on these devices that don't exist.
http://www.freepatentsonline.com/3899144.html
Although I believe that they do exist, and that their goals are not to endanger the public (directly), the great majority of those we see are normal exhaust contrails. Reading this (and other patents) convinces me of their existance, whether I'm O.K. with the idea or not. Mr Q