Fictionalised, within the last decade or so. Mechanistically understood, but like iron seeding in the ocean, contentious.

Efforts to increase cloud cover over the reefs in Australia have less contention because it's basically misting seawater so doesnt' invoke the 'oh no, di-hydrogen oxide in volume is poison" thing. Sulphur Dioxide has been demonised for a long time now.

Counterfactual effect of changes in shipping praxis is interesting, scary.