Literally, the moral and logical answer to your question is to lead a bloody revolution and end this by force tomorrow to prevent absolutely as much poison from leaking out as possible. Not because it will save human lives necessarily (although I think the rates of death from such a revolution as compared to a few decades of worsening conditions before we get to the same point of lowered emissions is just about a wash), but because it could possibly save some measure of biodiversity which will allow for the POSSIBILITY of humans continuing as a species in some randomly calmer areas among the chaos.

That being said, I have been thinking that for a long time and haven't worked myself up to trying it. Dying painfully is kind of scary, even if you don't like living.