Fictionalised, within the last decade or so. Mechanistically understood, but like iron seeding in the ocean, contentious.<p>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.<p>Counterfactual effect of changes in shipping praxis is interesting, scary.