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> None of that will replace the lack of oxygen, though-so open a window.

I would think that it would be really hard to make any kind of dent in how much oxygen is in the room... wouldn't, by the time you get there, you have long long since died of carbon dioxide poisoning?

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Just small increases in the CO2 concentration can cause brain fog and headaches even if you won’t literally die from the room. Normally the feeling of a room being “stuffy” is the first sign. That’s a mere 600ppm where that begins to happen.

Here’s the basic levels of CO2 that are acceptable in a room. I know I get drowsy in rooms without good airflow when in meetings at the office.

https://www.engineeringtoolbox.com/amp/co2-comfort-level-d_1...

And yet in not many years that will be atmospheric levels. This is the element of fossil fuel emissions nobody seems to be discussing, and we don’t know its consequences

In some chess tournaments played remotely they put CO2 sensors in players' rooms and there was a surprisingly big correlation between good and bad form and CO2, to the point that some players started to play with open windows and warm clothes during the winter (for example Jan Krzysztof Duda).

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