Combining ocean acidification, thawing tundras, and burning forests, my hunch is the climate change has already entered a positive feedback loop.

So even if we stopped anthropocentric CO2 emissions altogether, things will continue to worsen.

(I just learned about ocean methane clathrate deposits. So I may have been too optimistic.)

We'll need to sequester carbon at industrial scale to save our civilization. And figure out how to stop the non-human sources.