Well, except for the ones that are doing exactly that.
https://www.newsweek.com/florida-insurance-crisis-explained-...
Insurances are already reacting. Just a few days ago there was an article showing how home insurances are cancelling contracts based on drone and other aerial surveillance, yeeting people for the horror of having a trampoline in their garden. And beyond that, insurance companies are pulling out of risky markets... and of course, people are crying foul and want the government to bail them out [1].
Edit: Seems like you've been downvoted to grey - I don't get why, because (other than not being aware about recent developments in insurance markets) you are raising a legitimate question.
[1] https://eu.palmbeachpost.com/story/opinion/columns/2024/03/1...
Part of the value of real estate is the short term use of that real estate.
Part of the value is the resale value.
If anthropogenic climate change is really causing sea levels to rise, then the predicted future resale value of oceanfront property must be near zero, which must be causing prices to drop sharply.
Except the prices are not dropping.
Markets predict reality better than most predictors.
If anthropogenic climate change is real, then the insurance on oceanfront properties would be cancelled. That is not happening.
A trampoline leads to neighbors' kids jumping on it and breaking legs, which leads to lawsuits, which lead to losses for insurance companies.
Trampolines are a good reason to cancel homeowners insurance.
THAT HAS NOTHING TO DO WITH CLIMATE CHANGE.