As always, also worth noting that this is literally acid rain. Putting it in the stratosphere is intended to lessen the amount of acid rain per warming averted, but it's still the exact same chemicals that caused acid rain. There are very good reasons we removed sulfur from gasoline.
Acid rain is probably better than global warming, assuming it doesnt literally kill the ocean. Its good that we have a potential backstop- we could definitely halt warming in a very short time and it might not kill all life. We can even produce the necessary sulfur for a short while. Or like, we could stop warming without dumping incredible amounts of acid in the air we breathe.
> we could definitely halt warming in a very short time
The limit estimated (from models) here [0] is a decrease of -2 W/m^2 at most.
The IPCC scenarios are equivalent with a number of plausible energy imbalances by the end of the century, ranging for 2.6 W/m^2 (RCP 2.6) in the best and 8.5 W/m^2 (RCP 8.5) in the worst case. [1]
So even in the best case it might very possibly not be enough to halt everything. Maybe it can buy us some time, but I think the only viable path forward is to stop as soon as possible and then carbon-capture it back.
(See also this graphic [2] for possible pathways to stay below 1.5°C warming, all of which include carbon capture, up to half of current emissions starting in 10 years (in the best case by land-use changes, in all others by actively removing the carbon).)
Acid rain is probably better than global warming, assuming it doesnt literally kill the ocean. Its good that we have a potential backstop- we could definitely halt warming in a very short time and it might not kill all life. We can even produce the necessary sulfur for a short while. Or like, we could stop warming without dumping incredible amounts of acid in the air we breathe.