[rwyinuse]

My understanding is that also volcano eruptions have temporarily cooled down global climate. So, such an abrupt, high-volume dispersal seems to work too, although probably not what we would want. If both sudden volcano eruptions and maritime emissions cool down the climate, I can't see why spraying stuff from airplanes wouldn't work too.

Of course there are going to be unknown side-effects, and suddenly stopping it would be bad. But it might still be better than doing nothing at all. It's a shitty band-aid fix, but I would still take it over "hothouse earth" type scenarios.