Well, you're in luck. It won't just be Californians, though. You'll have new neighbors pouring in from all over the world, cramming up in the liveable spaces that'll be left. It's gonna be cozy. And who knows, maybe you'll even have to spare a room or two of your house for them? Just as Germans had to when the refugees from the former eastern territories poured in after WW2.
Who said anything about volunteering? Europe couldn't stop ~1 million people from entering in 2015, so what makes you think they can stop 50 to 100 times that number?
> Greenland, Siberia etc. Former frozen wasteland will become habitable
"Billions of Acres of Cropland Lie Within a New Frontier. So Do 100 Years of Carbon Emissions: Crops grown on this land could feed a growing population. But if these soils are plowed, they could unleash as much carbon as the U.S. emits in more than a century." https://insideclimatenews.org/news/12022020/agricultural-fro...
That former frozen wasteland will become one huge swamp. It'll take a whole lot of work to make it habitable by modern standards. That's assuming it doesn't just dry out and start a decade long peat fire that suffocates the area.
Just drop the doom and Millenarian attitude…
Not sure if you and I read the same IPCC report, tbh.