Insurance companies don’t much care whether Climate Change is man-made, unless they’re playing a deep enough game that they’re predicting politicians’ responses to it and the energy industry’s willingness to fund politicians who’ll say the politically correct “Don’t regulate us, bro!” instead of legislating to protect the planet. (They’re probably playing some of that game too, but it’s depressingly easy to predict how the politicians will react to the people waving money at them.)
Insurance companies do have other reasons to dismiss areas as uninsurable - there are way too many cities that allow building in flood plains, and people building expensive vacation homes and tourist hotels on scenic beaches that have been washing away or hit by hurricanes for centuries. And the Internet boom meant that you could work from anywhere in the world you wanted so everybody moved here to the San Francisco Bay Area, driving up real estate prices to ridiculous levels in spite of our habit of having occasional earthquakes, so a lot of insurance companies can’t handle the market-driven increases in financial risk even though housing construction is getting more earthquake resistant.
I used to live on a sand bar in New Jersey. I knew I was renting the place I lived in (because I was); some of my neighbors thought they actually owned something, when actually they just had houses temporarily sitting on sand a couple feet above sea level behind a sea wall that the Army Corps of Engineers occasionally rebuilt.
