I think it&#x27;s far more of a threat than any of those things. Nuclear war isn&#x27;t inevitable, and wouldn&#x27;t destroy the entire world, just the countries at war. Even a ridiculous world wide nuclear war would leave tons of survivors. Volcanoes and meteorites are so unlikely they aren&#x27;t even worth mentioning. Superbugs would have to be intentionally engineered by a malicious group with a lot of resources, and so are very unlikely.<p>AI is inevitable. It&#x27;s very likely to happen in our lifetime. And it&#x27;s very likely to kill us all. And explaining every reason why I believe those things could fill an entire book, so I seriously recommend reading <i>Superintelligence</i> by Nick Bostrom.