[meh8881]

Most of the world becomes uninhabitable or volatile during that lead up where the world is getting hotter. Not decades where it’s fine and then too hot. The coast lines will rise pretty quickly. Most fish will die. Most agricultural centers will become unfarmable.

Sure you can make a bunker and live off of supplies. But you should not expect any substantial infrastructure or long distance travel to remain. You will not have fuel. You will not have steel. You will not have farms. You will not have water infrastructure, and ocean water will begin to pollute sources while others dry up. You will not have mega fauna to hunt. Most large plants will die. Your generation facilities will quickly become unuseable.

Sure there will be small plant life and critters and life will adapt. But nothing that a human population will be able to survive in. Living off of dwindling supplies is in a sealed off environment like guy on mars doesn’t count as surviving meaningfully imo.