This aspect of CO2 should scare us.

[roamer65]

https://www.theatlantic.com/science/archive/2019/12/carbon-dioxide-pollution-making-people-dumber-heres-what-we-know/603826/

[mahatmakanejeeves]

1. The article is about the concentration of CO2 in closed rooms.

There is substantial but inconsistent evidence that as carbon-dioxide levels rise, they could affect human cognition.

That doesn't sound any too definitive.

OSHA's permissible exposure limit for CO2 is an 8-hour time weighted average of 5,000 parts per million.

§ 1910.1000 Air contaminants.

It's in Table Z-1.

[roamer65]

2. With the baseline of 420 and rising it's going to get interesting much sooner than anticipated.

[mahatmakanejeeves]

3. Change the air more often. NT

Atmospheric Carbon Dioxide Growth Rate

{snip}

In 1960-1970 the growth rate was slightly less than about 1 ppm/y, but the growth-rate has been steadily increasing, reaching 2.40±0.26 ppm/y (mean ± 2 std dev) at the middle of 2022. This means that currently, the concentration of carbon dioxide is growing by about 2.40 ppm per year.

(5,000 ppm - 420 ppm) / (2.40 ppm/year) = 1,900 years

Just to be on the safe side, cut the PEL to 2,000 ppm and raise the growth rate to 3.00 ppm per year.

(2,000 ppm - 420 ppm) / (3.00 ppm/year) = 525 years

[IbogaProject]

4. No one knows when the altered O2 & co2 levels will matter

5,000ppm is the OSHA standard for 8 hours. Maybe harm could come from 500, 600 over a whole lifetime. Or it might already be harming children. OSHA is focused on healthy adults at work, 40 hours a week.

[mahatmakanejeeves]

6. Yes. OSHA is concerned with issues in the workplace. Thanks. NT

[markodochartaigh]

5. A lot of studies have been done

on the air quality in submarines. One way that exposure to CO2 in buildings, or even in submarines, is different to increased environmental CO2 is that our bodies can buffer increased CO2 levels experienced during short term exposure. But if the ambient CO2 levels were above 1,000 ppm, then even before birth and every day after birth one would be exposed to these levels. Kidney and brain function would be severely affected as would bone density. Of course by the time that ambient CO2 levels will have reached 1,000 ppm enough carbon will have been released into the atmosphere to have caused serial cereal harvest failures and the subsequent starvation of most of humanity.