If we face an anoxic ocean event, this simply isn't true. Such an event could leads to the upwelling and release of huge quantities of hydrogen sulfide. Diffuse

If we face an anoxic ocean event, this simply isn't true. Such an event could leads to the upwelling and release of huge quantities of hydrogen sulfide. Diffused throughout the Earth's atmosphere this would kill nearly all life, and remain present in lethal concentrations for hundreds of thousands to millions of years judging by the fossil record from the Permian-Triassic extinction. That's a long time to rely on artificial life support systems. https://en.wikipedia.org/wiki/Anoxic_event#Atmospheric_effects https://en.wikipedia.org/wiki/Anoxic_event#Atmospheric_effec...