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> you'd need a ppm of 50,000-100,000 to feel any real effect from CO₂

Have you used the wrong numbers here or are you advocating some novel and unorthodox ideas about CO2? Did you mean 5,000-10,000?

Because as far as I can tell, those (5-10%) are the levels where people start to do things like lose consciousness from CO2 poisoning.

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No, I think he's correct based on the study linked from this other interesting comment here: https://news.ycombinator.com/item?id=34651244

The linked study directly states that loss of consciousness occurs after ~7 minutes of exposure to 10% CO2.

And that's the obvious threshold. After all, no one can tell whether they've been drinking until they wake up on the floor, right?

nope, that's exactly right. at 5-10% you feel real effects, not at 1200ppm or 3000 or any other psychosomatic level.

"poisoning" is a needlessly loaded word in this context. CO₂ is literally critical for life. just about any molecule/compound at those concentration levels (outside of those we co-evolved with, like nitrogen) will have noticeable effects as well.

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