Peter GleickAtmospheric CO2 has passed 430 parts per million.
The last time atmospheric CO2 was at 430 ppm was during the ancient Pliocene Era, three to five million years ago, and humans didn’t exist.
aœ bärlin@petergleick What is the amount of CO2 that harms people (mammals, air breathing creatures) directly. The brain needs "fresh air“ to work properly.
(Heat diminshes the ability to think clearly.)
(Heat diminshes the ability to think clearly.)
Imran Nazar ~ عمران نزر@aoeBerlin @petergleick The British health and safety executive state:
CO2 levels consistently higher than 1500ppm in an occupied room indicate poor ventilation and you should take action to improve it. [https://www.hse.gov.uk/ventilation/using-co2-monitors.htm]
So there's a way to go before outside is actively stuffy.