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This will, of course, start to bite immediately on the margin.

If you have a poorly ventilated building, you're already at a disadvantage now with >400ppm outside air (higher in cities) than you would've been, say, 200 years ago with 280ppm air.

CO2 is absolutely a pollutant. Yes, plants like it, but we are not plants. It is a waste product, and too much of it affects mental performance.

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our bodies are pretty darn good at reducing CO2 in our blood. CO2 isn't the problem for our bodies, by far.

Indeed. 400 ppm of CO2 compared to 300 is likely negligible for human respiration, compared to the 201,000 ppm O2 and 780,000 ppm N2 in the atmosphere.

0.04% vs 20% and 78%

Well, N2 molecules have very strong bonds that aren't easily broken so they ddon't tend to react with much of anything inside our bodies.

The big issue with CO2 indoors is that it is a strong indicator that airflow is poor and oxygen levels are usually low in those buildings.

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