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This is a meme on hacker news that's usually stated as a fact, but I'm not sure there's any robust evidence of cognitive impairment at <1000ppm

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https://www.sciencedirect.com/science/article/pii/S036013232...

> In this study, a systematic review and meta-analysis of fifteen eligible studies was performed to quantify the effects of short-term CO2 exposure on cognitive task performance.

> The complex task performance declined significantly when exposed to additional CO2 concentrations of 1000–1500 ppm and 1500–3000 ppm

Additional

It looks like there might be a very small effect starting at around 1000ppm but so small that many studies find no difference at all, and reliable effects are only noted at 3000ppm or more.

So we're a long way from needing to scrub co2 from the atmosphere to get any work done

Not from atmosphere but we need good ventilation. Over 2000ppm in offices is very common.

Not everyone in a population will be affected the same by the same conditions, and the constraints of peer reviewed research make them often a poor choice for guiding personal decisions. By the time you have conditions bad enough to statistically prove harm in a large population, you’re likely already way past causing harm worth preventing in some subset of the population.

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