Well, the trails are not always contrails. They are geoengineeing to dim the sun.

This is going on for some years "experimentally" and was recently approved by government.
https://www.theguardian.com/environment/2025/apr/22/uk-scientists-outdoor-geoengineering-experiments
https://www.sciencealert.com/harvard-scientists-say-reflecting-the-sun-
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