Is the world becoming uninsurable?

Every era has it's Malthusian alarmists and without fail, each has been proven wrong by exactly the same thing the author decries and says won't work this time: technological change and adaption. There's no reason to think this time will be any different. Will some places become uninsurable? Sure, plenty of places over time have become uninsurable. Will the whole world became uninsurable? Absolutely not, because we are quite good at adaptation in the face of adversity.

The issue in California is not the price of insurance, it's availability because of extremely myopic ballot initiatives that are entirely political in nature. Should insurance be fairly priced, then the market can force people out of uninsurable areas and into areas with far less chance to burn.

You can't live in places where your home is going to get destroyed every couple of decades by wildfires, floods, or hurricanes. There are more of these places now because of climate change and a lot of people are going to have to migrate over the next century, like huge global migrations. Insurance can't/won't allow a bunch of people to deny this reality any more (or at least much longer). LA is going to be pretty uninsurable unless the local governments do a lot to mitigate the fire risk.

As the 173 million strong population of Bangladesh can attest, they can and do live in such places.

"Each year, on average, 31,000 square kilometres (12,000 sq mi) (around 21% of the country) is flooded. During severe floods the affected area may exceed two-thirds of the country, as was seen in 1998."

https://en.wikipedia.org/wiki/Floods_in_Bangladesh

Most of the world does not want to aspire to be Bangladesh, but humans have been living in extremely disaster-prone areas for millennia because the short-term benefits (rich soil etc) outweigh the occasional catastrophic losses.