I'm also interested in the cognitive effects of CO2, and I have a great deal of skepticism in the studies that say small amounts cause noticeable deficits preci

I'm also interested in the cognitive effects of CO2, and I have a great deal of skepticism in the studies that say small amounts cause noticeable deficits precisely because we know people can carry out complex tasks for months on end inside a submarine. I know other people have also remarked on this (absurd!) inconsistency but haven't seen it satisfactorily resolved. I will say that it's much easier to believe that the studies are somehow flawed and people don't get seriously impaired by 8000 ppm than it is to believe that we've gone nearly seventy years without noticing that the people who are supposed to launch nuclear strikes in the event of WW3 have been retarded all this time.