There are a zillion patents. That does'nt mean that these chemtrails which are all over the world are part of a vast conspiracy to affect the weather.Who are all these"{ in the know" people? I looked at a couple of the shorter videos. One thing they claim is that vapor trails don't naturally stop. om what I've read , they do suddenly stop based on very minor climatic variations as they move through the sky.I also read that some companies substitute fuel with more toxic substances to save money.