What's the mechanism for boiling oceans? I thought the Sun was a few billion years away from going red giant. Personally, if I had to bet on an early filter, I

What's the mechanism for boiling oceans? I thought the Sun was a few billion years away from going red giant. Personally, if I had to bet on an early filter, I'd go for the eukaryotic transition. Not so much the "having a nucleus" part, more the "dealing with genes at scale" part, because it requires so much machinery so low in the stack with so many knock-on effects and such a long payoff horizon. It's like the single-thread to multi-thread transition, except instead of everyone agreeing that multi-thread was the future and merely struggling to get there, we instead had a situation where everyone was trying to eat (literally, as in cannibalize) the proponents of multi-thread if their programs failed to go faster per dollar of hardware.