We've all seen the jet trails in the sky that somehow spread into a haze across huge areas.
They are not condensation trails - those quickly evaporate in most conditions.
Our government has denied (2020) that they are are involved:
"The government is not deploying SRM, and has no plans to do so"
- but that rather begs the question: "who is doing it, and why?" and maybe "why are you so unconcerned?"
(4 hrs 28)