Solar geoengineering would alleviate the symptoms and so take pressure away from treating the root cause. And so I'd say that it would make things more expensive in the long term as the underlying illness would continue to get worse, festering under that bandaid.

I have never seen a geoengineering that does not seem to have big possilbe side effects and cause a fair amount of its own co2 emmisions (constant flights or whatnot to renew). the only thing to me that seems maybe is the idea of a space shade which could be easily scrapped if side effects came up.

I don't understand how solar geoengineering is even on the table. Wouldn'it fuck up agriculture – and plant life in general – even more than it already is? Isn't it a choice between a famine because of the climate or a famine because the sun is blocked off?