nobody thinks aerosols are a magic bullet, however we are not switching to nuclear, we are burning coal, gas, oil, whatever we can light - we burn. So if using aerosols is what it takes to go on longer, until the oceans die from acidification due to CO2 we are adding (50GT annually), we will end up resorting to those methods.
There is a class of aerosols that can help both, to bring the heating down by blocking a few percentage points of the Sun light, while helping to deacidify the ocean, I am talking about Sodium (Na) and possibly Sodium based energy production. Sodium burns in water, it can be used to power engines (we don't have a good nozzle solution for Sodium right now), its vapor (NaOH) will block some of the Sun light and when it gets down to the ocean water it will act as a base, reducing acidity by combining with the CO2 and producing Na2CO3, this will sink to the ocean floor.
If we actually really cared about our lives and lives of everything on this planet, we would work on these solutions right now. But we cannot even get together and stop maniacs that are actually murdering people right now, the russians need to be stopped, the muslim fundamentalists in Iran and their proxies in Gaza need to be stopped. Our politics prevents us from doing anything that ir right, so I don't expect this to happen either. Eventually the only people surviving will be some multibillionaires in their bunkers and the rest of us will die off, maybe this is what we need as a species to drastically reduce the stupidity factor, I don't know.