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originally posted by: Zaphod58
a reply to: MALBOSIA
We are. Persistent contrails spread into upper level cirrus cloud layers. It's also a great way to tell if a front is moving in. The front pushes cool moist air ahead of it, resulting in more persistent contrails.
We can keep saying they naturally form, but the natural forming contrails are not natural at all and have become a problem because of quantity. You can pee outside near your raspberry bushes and it won't hurt them, but if everyone does it, they do not produce berries. The amount of Jets in the air is too high.