We know almost nothing how the Earth system handles CO2 stress... or how it would handle SO2 stress...

There is a logical possibility that the core functionality of the Earth system is to handle any kind of destabilizing stress, be it an asteroid impact, or over-expansion of some new highly effective but greedily species. Yeah, I am talking about Earth as a functional cybernetic system - the Earth "knows" its forces, it can order them to solve strained situations. The Earth might have done it many times locally, and on several occasions globally. Nothing happens by mere deterministic chaos... Damn, even seismic events might be linked cybernetically to global warming, as they are powerful signals to biosphere. The Earth might already be "committed" to a course of action... but it might be following and learning signals of our behaviour as well. If this interpretation is remotely true, our technological solutions might be marginal compared to unleached Earth's powers. We would be facing the challenge of surviving the rewind of a geological cycle, provoked by ourselves. On the other hand, the cybernetic model offers the possibility that the Earth might "appreciate" measures of genuine stress relief, that humanity and the Earth might communicate for mutual benefit, ha ha.

I leave this as far fetched as it might seem.