Related, this could be what happened to Mars: https://www.space.com/mars-microbes-triggered-climate-chance-extinction https://www.space.com/mars-microbes-trigge

Related, this could be what happened to Mars: https://www.space.com/mars-microbes-triggered-climate-chance-extinction https://www.space.com/mars-microbes-triggered-climate-chance... I think we're looking at a future with far less humans, but not one without humans. The poles will warm and become comfortable, the oceans will warm and bring humidity, bringing the tropics north, as they once were. Life, and humans, will carry on with their never ending struggle. I think the only end to humans could be political, but even then, humans would be just fine, even with a nuclear war. Nobody will be nuking the Papuans who live in the forests of Papua New Guinea or the random farmer who lives out in the middle of nowhere in the midwest.