How? All the ideas that are being looked at come from natural cycles that are being exploited. No one is talking about releasing some chemical that no one understands up there they are talking about causing algae blooms, inducing acid rain in the middle of the oceans, and painting stuff white. This isn’t cutting edge. Also it isn’t a one and done deal, it will require constant infusing of cash.

We know that sulfur and dust in the area lowers temperatures. The experiment has been run before. Look at average temperatures and see what happens around the WW2 era where steel has to be made using cheap dirty sulfur rich coal quickly.

We know painting stuff white makes it reflect more energy.

We know that alga eats a lot of carbon and sinks. We also know that alga is always limited by a few trace elements it can’t get enough of.

None of this stuff is new. All of it is going to cost a fortune every single year. Presumably if somehow someway painting stuff white made things go crazy we would stop spending tax dollars on it.