This isn't another conspiracy theory about contrails like the various nut jobs go on about, they aren't spraying the unsuspecting public with mind controlling drugs or mass vaccinations though they do have a long term effect. Contrails are just water vapor though there is a downside and that is they contribute to climate change as they trap heat much like cirrus clouds plus the carbon from the jet fuel and both have more impact now that the planes are flying higher. Flying higher uses less fuel but the contrails last longer making it a wash as far as the effect on climate change. At least you can put your mind to rest about Chemtrails!
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