by Doodle Dee. Snickers » Sun Sep 17, 2017 4:39 am
I would put my money down on a combination of global warming and overpopulation leading to nuclear armageddon. Maybe a 100 years plus from now, resources will restrict, our population will have continued to balloon unsustainably, and that will be when things get really dangerous. We will be consuming far quicker than Earth can replenish (a line we crossed in August this year) and eventually a combination of that and the impact of global warming will make people desperate.
Countries with weak security and nuclear weapons (think Pakistan) and even those that arent could see those weapons taken by a apoplectic populace and utilized against other countries they see as a source of the problem, kicking off a nuclear free for all. Or, also totally possible, in their desperation, some nuclear armed country sees its own version of Nero ascend, and they kickoff the end of the world.
Coming in second would be a supervirus. Third would be a sudden cosmic calamity. Dark Horse entry would be death by AI.