We probably can't adapt fast enough. Change sea level a few inches - coral reefs die off and start regrowing at the new optimal shore location. It takes 100 yea

We probably can't adapt fast enough. Change sea level a few inches - coral reefs die off and start regrowing at the new optimal shore location. It takes 100 years to rebuild. Meanwhile fish populations oscillate. When they are low, people (2B of them) go hungry. Hungry people protest, governments change or fall, wars start. Remember those thousands of Syrian refugees that caused such a stir? That was a few thousand people. Raise that to 10,000, then 100,000, then 1M, then 10M, then 100M. We have no conceivable way to humanely cope with worldwide upset of that magnitude. If it comes to pass, it will surely collapse civilization. As it has repeatedly in the past - Mayan, Babylonian, everybody throughout human history. And that's just fish.