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A comment on Carbon dioxide now more than 50% higher than pre-industrial levels. Parent comment

Re:Carbon dioxide now more than 50% higher than pre-industri... by prometheus76 on Monday June 06, 2022 @10:03AM (#31640624)
The chart in the article you linked to shows that currently, the level of CO2 in the atmosphere is 0.04% of the air we breathe, and that lifetime symptoms of hypercapnia do not appear until that number is 1.0%.

That means that CO2 levels would have to increase 25 times their current level in order for your fear of hypercapnia to become a problem.

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Re:Carbon dioxide now more than 50% higher than pre-industri... by pmontra on Tuesday June 07, 2022 @05:13PM (#31660136)
From https://en.wikipedia.org/wiki/Carbon_dioxide#Below_1%

> A study of humans exposed in 2.5 hour sessions demonstrated significant negative effects on cognitive abilities at concentrations as low as 0.1% (1000 ppm) CO2 likely due to CO2 induced increases in cerebral blood flow. Another study observed a decline in basic activity level and information usage at 1000 ppm, when compared to 500 ppm.

With some caveats about the quality of those studies.

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