Interesting read, but I'm surprised that there was no mention of the Holocene extinction. Given the current rate of extinction, especially of plants, we could be looking at a complete ecological collapse in the not too distant future. It seems like a more serious existential threat than asteroids or rampant AI in that it's actually happening as opposed to something that might happen or could happen.

Comment hidden because you are ignoring dag. (show it anyway)

That's a good and interesting point. Maybe an extinction event is like a real estate bubble - it's hard to tell when you're inside one.