What I’m proposing is something like the start of the technology of a dyson sphere tbh, it would be further out into space and ideally only maintained by machine, no humans. If it has issues, the panels can be turned perpendicular to the direction of energy coming from the sun to let in more sun, or fuck, we could just set bombs on it and later remote detonate it if it’s truly a concern.

I think the impact of spreading a bunch of sulfur or other particulates in the air is just a bad idea in terms of health for everyone (a major component of smog/pollution is sulfur, and we know sulfur works bc during covid, less ships running meant less sulfur and heating accelerated) and having a large blanket or shield in space would be less risky in that aspect but yes, more technically challenging. However, Beijing, MIT, Stanford, Japan, and Germany etc should be able to figure it out easily - they pretty much already made a cure for HIV and rabies together and permanently altered warfare w invention of drones and AI.