Some may try an interstellar voyage, at a low acceleration and multi-generational, but the odds of finding just the right planet and making it at high speed through a long distance with small space rocks invisible until puncturing the ship, are just not good.
Then there are those who build underground fortresses with a Gen 4 reactor and good water supply, and large grow light section, in the hopes that the surface will eventually be livable again. It won't be if methane goes into much worse releases.
My proposition to blow Yellowstone is impossible at the depth of the magma chamber, to even drill 25 miles deep is way more than the 8 miles record that took twenty years to drill (in Russia). A natural super eruption of it is just not due in time.
At this point it would not take much to crash the population; dollar failure, Cascadia, Katla Volcano, or the La Palma slide. If they do not happen, then insufficient food and water with increased CAGW will 'naturally' crash the population after the tundra methane self release point, and well before mid century.
A somewhat limited nuclear war within less than a decade, could put up a nuclear winter and kill enough to just maybe stop thermageddon and the long term death of most of the biosphere (except deep ocean thermal vent extremophobes, maybe).
No one really wants these things, but it is a hope for a future, if the open ocean warming to 52GT tundra release of methane (the initial pulse, with a hundred times more to be released as temps rise) is prevented by aerosols cooling long enough. One global winter may not be enough.
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