We can easily build fire-proof houses and people are starting to do it in California. That removes a lot of the risk from wildfires.

Easily? Housing prices soared here when codes changed to build windproof houses....Wasn't much help when a cat 5 hurricane slammed into the panhandle.
Housing prices are already through the roof in California. I hear tales of folks without homes as insurance proved insufficient. If your house and land burned to the ground tomorrow could you "easily" rebuild?

Easy is a great word when you don't have to actually do it yourself.

You and science probably have easy answers for the next drought too...? The next earthquake? The next flood?
Good coffee, good weed, and time on my hands...