How about we just make a giant heatsink that reaches into space instead. Then we can cool the whole planet. Coming up with crazy ideas is cheap, but the logistics are obviously impractical.
Look into radiative cooling. Basically this, but more practical. Several companies working on it: https://www.skycoolsystems.com/
We had one. It was that sulphur used in shipping fuel.
Look into radiative cooling. Basically this, but more practical. Several companies working on it: https://www.skycoolsystems.com/