[usrusr]

Climate may change slow (by human standards, not by climate's standards), but civilization collapse can be pretty much flip-of-a-switch instantaneous.

[beat]

Right. But climate change may not be a fast enough trigger to cause an instantaneous collapse of civilization.

And at what scale are we talking? A local community, or a nation, or the world? The instantaneous collapse of global civilization, with no instantaneous trigger, seems unlikely to me. The idea that no government will be able to stand and keep order, from the UN to the US on down to every town in the world? Nah.