adding to the confusion, is the multiple purposes, thus multiple products being sprayed - from heat reflection and radar imaging, to seemingly more recent plasma experiments, and chemical endothermic application. Ten years ago I was seeing a chemtrail that was a slightly darker blue color than the normal sky, but haven't seen it around here lately (there's patents for blue chemtrails). Have seen what appears to be carbon black lines. Also ~15 years ago I would see a plane followed closely by another one, and then a haze would appear - 2 part polymer? Knowing what a typical FAA approved flight path would be, helps decipher what you're looking at - commercial flights aren't allowed to fly as closely as these persistent lines, too close for FAA standards. I think most of what they've been doing is weather modification - making an area drier and cooler, also using reflective sprays to create stepped curved parabolic/ fresnel type lenses to heat a distant region, whether lifting a jet stream or moving a pressure boundary, it would be nice to know what's going on day to day. The greenhouse gas everyone is absolutely silent about is water vapor - remove enough water vapor and things get cold quickly, add enough water vapor and things get volatile. *Making the west coast uninhabitable to rational people may have a strategic longterm purpose.