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This guy Mark Lynas studied the models and wrote a book about it, but then he wrote it again based on newer models, so make sure to find the latest one called "Our Final Warning: Six Degrees of Climate Emergency" for a grizzly drilldown into the centigrades towards extinction. Few models deal with warming beyond three degress, in itself a point of some consideration, but the references are all there and here's the sy…
Actually I was kinda hoping for just a model or some peer reviewed conclusions. I'm just not in the mood to devote a lot of time to what sounds (to me) like hyperbole: If the earth stabilised at +8 degrees celcius I find it hard to understand why the entire earth becomes literally uninhabitable.
If you want to think of a way it could be possible, though, think of those areas that would be habitable, realize that they would be highly contested, are mostly presently permafrost, and consider your own ability to both protect and survive on melted tundra and reproduce there, given you will starve in a single season without food.