A much closer problem is the certainty of another ice age in the Earth's near future. It is problematic that our present civilization could survive glaciers over New England, Manhattan, the Upper Midwest and Northern Europe. Evidence suggests there have been seven attempts for humans or ancestors to colonize Great Britain. We are on the seventh and all the previous attempts failed, succumbing to the ice and cold. The only habitable parts of Europe in the last ice age were refuges in Southern Spain, Southern Italy and Southern Greece.
So, if the present levels of CO2 continue to increase and somehow stop the present long term climate cycle so that Earth does not plunge into another ice age, that would be a very good thing indeed for human civilization and the Earth. Unfortunately, it's all based on politicized junk science.
Great Britain was settled each time, and occupied for thousands of years, but the occupation may have ended with the next glaciation. Trouble with really thick glacier cover that goes on for hundreds of miles is, nothing much to eat, and no fuel for fires. Even the sudden formation of the English Channel didn't slow down prehistoric humans.
Also, I'm not on board any gradualist onset models.
It's interesting that "fossil" CO2 levels found in deep ice cores show that the CO2 levels rose 100s or 1000s of years *after* the world warmed back up.