Seventy-four years after the end of World War II, we’re still living with the existential risk of nuclear holocaust — and it all began on a patch of desert called the Trinity Site — Asteroids, supervolcanoes, nuclear war, climate change, engineered viruses, artificial intelligence, and even aliens — the end may be closer than you think. For the next two weeks, OneZero will be featuring essays drawn from editor Bryan Walsh’s forthcoming book End Times: A Brief Guide to the End of the World…