Former CEO of AXA, a major French insurer, famously announced that a world at +4°C would be "uninsurrable" [1]. That was 10 years ago. It's true that most predictions about climate are wrong - most of the time, they're optimistic. (Not always, fortunately [2]) [1] https://www.leparisien.fr/economie/business/special-cop21-un... [2] https://www.theclimatebrink.com/p/emissions-are-no-longer-fo...
+4°C is to the upper end of projections if it did (which is not probable) happen it'd take until the end of the century if we were to get there the entire world will be a different place; everything will have advanced so we won't be insuring our present world with our current knowledge and current tech but a future world with future knowledge and future tech
Sure, we could bulldoze everything and build new stuff that can handle a +2C, +3C, +4C, etc... world, but that's expensive.