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I would posit that the level of CO2 you need to cause detectable society wide problems is probably lower than the level that makes a room actively uncomfortable to be in.

There's a reason why we already have universal colloquial language to describe a room with too much CO2, "stuffy," "getting some fresh air to clear your head." We all know this stuff intuitively, we've experienced it directly our whole lives.

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You can posit whatever you like, but I don't see any evidence.

Edit to reply to ninja edit:

> There's a reason why we already have universal colloquial language to describe a room with too much CO2, "stuffy" "getting some fresh air to clear your head." We all know this stuff intuitively, we've experienced it directly our whole lives.

First off, you're going back to the perception of minor discomfort to defend the claim that CO2 levels that aren't even high enough to cause minor discomfort are high enough to cause "detectable society wide problems". This strikes me as incoherent and evasive. Secondly, you're assuming that the minor discomfort of being in a "stuffy" room is entirely caused by CO2 concentration. (In my personal experience, body and food odors are the main sources of discomfort when I'm in a poorly ventilated space.) And thirdly, you're assuming that this discomfort necessarily causes poor cognitive performance.