I read an article that suggested these are 'Chemtrails'. I just didn't seem to get it, but who knows what goes on in the world, really.
You have introduced me to yet another conspiracy theory. I had never heard of "chemtrails" until I looked it up on the Internet after reading your comment. I think some people have too much time on their hands!
Spammers are back so comment moderation is back on. Sorry.