Earlier quoted context omitted.
He actually doesn't think it's viable, but thinks its the only card left to play. He's pretty sure that human civilization will be extinct this century.
> He's pretty sure that human civilization will be extinct this century. If they are, it'll almost certainly[1] be climate change or nuclear war, it won't be AI. [1] leaving some wiggle room for pandemics, asteroids, etc.
If we go extinct in the next 100 years, it's not going to be from climate change. How would that even work?