I'm certainly glad that I won't ever have to say, "Yeah, global acid rain seems like a good answer to the problem of global warming." But only because I'll be dead, and it will be other people having to say it.

I don't know of any such plans, but it seems unlikely that global industrial civilization will reduce its CO2 emissions anytime soon, which means that very hard times are coming for billions of people's children. Someone will be desperate enough to try it.

The increasing probability that humanity will become desperate enough to stave off climate change by pumping sulfur into the atmosphere follows from our ongoing failure to stop pumping carbon dioxide into the atmosphere. It's going to be a hell of a mess, and I do not envy the people who will have to deal with it.