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.forbes.com/sites/arielcohen/2021/01/11/bill-gates-backed-climate-solution-gains-traction-but-concerns-linger/ https://www.sciencealert.com/harvard-scientists-say-reflecting-the-sun-