I think there's a reasonable chance of that. We'll figure out different crops to grow, we'll move away from deserts, etc. It may be hard, life expectancy may fall steeply, but we'll adapt largely intact, and then we'll eventually run out of fossil fuels anyway.

But if you look at what's happening in the Great Barrier Reef. It's dying. The ecosystem is dying from the bottom, and nothing on top can survive either. I think this is a very real possibility too.