Earlier quoted context omitted.
None of them. Humans have always believed that we are headed for imminent total disaster. In my youth it was WW3 and the impending nuclear armageddon that was inevitable. Or not, as it turned out. I hear the same language being used now about a whole bunch of other things. Including, of course, the evangelist Rapture that is going to happen any day now, but never does. You can see the same thing at work in discussion…
If you look at timescales large enough you will find that plenty of extinction level events actually do happen (the anthropocene is right here). We are living in a historically excepcional time of geological, environmental, ecological stability. I think that saying that nothing ever happens is like standing downrange to a stream of projectiles and counting all the near misses as evidence for your future safety. It's…
It's not that it can't happen. It obviously can. I'm more talking about the human belief that it will happen, and in our lifetime. It probably won't.