Wait, neither climate change nor pollution are in the category of threats that are expected to literally end this species.

Within our lifetime we’re safe.

I think the point is 100-300 years (maybe longer?) from now things might reach a tipping point.

None of the above are actually expected to end the species. Not in anyone's lifetime, given the range of climates humans survive in. We might end up with a 90% reduction in population but Short of a massive asteroid impact or massive solar event it's pretty hard to imagine wiping out the entirety of humanity.

> it's pretty hard to imagine wiping out the entirety of humanity.

That's kinda my complaint here. Imagination is more important than knowledge. If we started much earlier in education explaining to kids how remarkable and fragile our existence is, how intricately interconnected we are with nature, birds, bees, mushrooms and microbes, then maybe Hollywood disaster movie plots wouldn't seem like the only route to the end of humanity.

I agree. But anything causing even a 10% population decline over a short period of time would have insane second order effects (e.g. nuclear war) as we fight over control of resources.

With only 10% of the population, we might find so much institutional knowledge lost that the remaining just can't feed themselves. We'd have to relearn hunting and gathering, and that just might not happen.

If we have to relearn hunting and gathering, that's not even closely compatible with feeding 10% of current human population, that's consistent with <1%, probably 0.1% or less of current population surviving. Feeding even 0.8 billion people still requires intensive mass agriculture.

Arguably climate change risk comes under #1 (not making enough money), because in the most likely climate change scenario, people above a certain wealth threshold will probably survive.

Not saying this will be a pleasant experience. Billions may starve. But that still leaves billions, and the purely mercenary reality is that money is what puts you on one side of that dividing line or the other.

From a certain perspective maybe. But I think that would be one coloured by a narrow mentality [0]

In a "purely mercenary reality", what you need to survive is not wealth, but peace, and that is something you cannot buy with many of the futures we're now looking at.

In a funny way, PFAS is a great metaphor. Forever chemicals have now been found in places nobody would ever have predicted. Bad things have a way of spreading in ways you won't see until they're at the gate. It might not be a good idea to bet the farm on isolationism and exceptionalism.

[0] https://en.wikipedia.org/wiki/Island_mentality

1, 2, 5 is my best guess.