DirtFarmer wrote:
If you have house plants, you want some CO2.
If your CO2 is too high, get some house plants.
Next thing you know, someone will invent a machine that will monitor the concentration of Argon in your house.*
* Argon concentration is much higher than CO2 as it accounts for almost 1% of the atmosphere. Argon must be bad for you since it is an inert gas and doesn't react with anything. It just takes up space that could be used for more productive elements.