3 ms·
Silly point. O2 shortages are irrelevant- 210,000ppm to 209,800ppm O2 is far less of concern than 300ppm to 400ppm CO2.
by mchannon 10y ago
Silly point. O2 shortages are irrelevant- 210,000ppm to 209,800ppm O2 is far less of concern than 300ppm to 400ppm CO2.
- mikeash 10y agoAnd keep in mind that atmospheric pressure (and thus the partial pressure of oxygen) routinely varies by 10% or more due to weather, and people live at altitudes where the pressure is as low as 50% below sea level.