The worst thing you can do when you're actively geoengineering is to abruptly stop doing it. So naturally we found a way we were already doing it and cut it immediately to make sure we fuck ourselves as much as possible :)
I'm almost convinced it's intentional at this point, the rich are busy building their offbrand vault tec bunkers and starting random wars for no real reason. Longtermism nonsense over the today.
Airborne sulfur comes with its own negative environmental consequences, though.