I've said this many times. Scientists and engineers need to aggressively develop geoengineering solutions, because humanity is going to need them. Our species isn't going to pull it's head out of it's ass until something catastrophic happens: entire farming regions turning into desert, coastal cities rendered uninhabitable, heat waves that knock entire power grids offline, cooking 10s of thousands of people to death because it's literally impossible to live if the dew point gets above 100 F. Stuff like that. Half of society has been denying the science for decades. You can't undo that kind of social programming quickly. Besides, a lot of people aren't intelligent enough to plan a month in advance, let alone a century into the future. So, until important bits of our system fail badly, it's mostly business as usual. By then, it will be too late to handle it gracefully and slowly. We will need to modify the planet on a scale that we've never undertaken before. The risks will be enormous. We could have avoided this, but nope. We're choosing to do this one the hard way. So be it. in 400 years most of humanity will probably be living in the arctic, which will be a balmy 80 degrees.