Comment by ifwinterco
6 hours ago
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.