AFAIK, Eliezer Yukowsky is one of Everett's Multiple Worlds interpretation of QM, proponents. As such, he should combine the small, non-zero probability that everything is going to go well with AGI, and this MWI thing. So, there will be some branches where all is going to be well, even if the majority of them will be sterilized. Who cares for those! Thanks to Everett, all will look just fine for the survivors.
I see this as a contradiction in his belief system, not necessarily that he is wrong about AGI.
CO2 is rather quick in abandoning the atmosphere via dissolving in water. If that wasn't so, the lakes in the mountains would be without life, but they aren't. It's CO2 that enables photosynthesis there, nothing else. The same CO2, which was not so long ago still in the air.
Dissolving CO2 in water is also a big thing in (Ant)Arctic oceans. A lot of life there is a witness of that.
Every cold raindrop has some CO2 captured.
So that story of "CO2 persisting in the atmosphere for centuries" is just wrong.
Some bots will hunt those greedy bots. Which will complicate, might even change the game.