The population crash is unstoppable, and the question is survival of our species and all the other species we need to survive, and the other species they need to survive. Sun, wind, hydro, and safe nuclear must replace CO2 producing energy. The total temperature rise by 2100 could be 25* from the 1800 average, the Eocene Maximum scenario. This would include an ocean level rise of more than 25 meters. The stopping of the Gulf Stream will cool Northern Europe, but the general temperature rise could preclude the Ice Age potential, for a while. In several thousand years 2 super volcanoes will go off in close proximity. Krakatoa and Yellowstone together could give off enough particulates for long enough to start the Ice Age due, close to on time. The magnetic pole reversal in progress will not have a lot of negative effect, some atmospheric thinning(and increased cancer rates and mutation rates) with the weaker magnetosphere and risk of major atmospheric loss with a direct hit of a large coronal mass expulsion or a nearby supernova(low probabilities).
The particulates from the super volcanoes, especially if they are separated by enough years for settling, may not be enough to bring on the Ice Age, and this cycle and maybe more could be skipped. Certainly, not the benevolent biosphere we were given. Life is tough and will go on.
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