My position is that climate change is an existential threat to civilization, but buildings are not at a risk that would make them uninsurable. We build cities both in very wet and very hot and dry climates without much trouble. Those are engineering problems we can solve without much trouble.

But with lots more money, which is what insurance deals with

Of course they’re insurable at some premium. The question is whether there is any premium someone is willing to pay that can also cover the risk.