With geo-engineering (leaving aside the wisdom of doing it) a key approach would be the distribution of aerosols in the upper atmosphere. The primary candidate seems to be sulphur compounds like SO[sub]2[/sub], or H[sub]2[/sub]SO[sub]4[/sub]. Both of these, however, tend to wind up producing acid rain.
Meanwhile, CO[sub]2[/sub] dispersion into the oceans is leading to progressively higher levels of acidification.
Now reducing heating but not addressing ocean acidification seems to be par for the course but I was wondering if there was a aerosol agent that could produce “basic” rain?
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IANA atmospheric chemist. See here
at least according to that other ideas for metal oxides seem speculative at best. SUlphur seems to be about all there is that is long-lived enough to have an effect, and cheap enough to be produced in teh volumes needed.
Heres’s another idea that amounts to simply increasing cloudiness by increasing sea level humidity and injecting the oceans’ natural aerosols including salt into the bottom of the atmophere.