The idea that humans won’t go extinct is pure hubris. Something like 99.2 percent of every species to ever exist has become extinct.

In 1962, the Soviet Union had about thirty-three hundred nuclear weapons in its arsenal, and the United States had more than twenty-seven thousand.

Twenty-seven thousand nuclear weapons. Merely 100 nuclear weapons detonated in the right places would be enough to set back human civilization a thousand years, or to end it altogether. We had enough nuclear weapons at one point to end the world 270 times over.

And just wait till cheap bio labs that can manufacture airborne rabies or similar become easily obtainable.