The were not stupid just didn't have a lot of technology. How do you know that they had boats and farmed?
I have a generator and enough money to find me a nice hotet.
Yes.
No, tsunamis are not tied to climate changes.
Scary stuff.
Well, the oldest surviving boat is over 8,000 years old and in the Drents Museum in the Netherlands. It is a well developed little boat, so clearly there was a lot of development prior.
Nice that you have a generator. So do I, how do you get your food. What do you do when your generator fuel runs out. Etc. etc. etc.
Monsoons have been going on for thousands of millenia. You think you can stop that?
No, not scary. Just history. History that shows your concerns are unfounded.