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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.




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