Am I reading this wrong, or does the author really keep mentioning "attempts" at things that will do absolutely nothing to CO2 levels? Non-venting range hood? B

Am I reading this wrong, or does the author really keep mentioning "attempts" at things that will do absolutely nothing to CO2 levels? Non-venting range hood? Box fan with filter? These will do nothing for CO2. The only way you're going to bring down CO2 levels in your dwelling is to bring in outside air. The best way would be installing a heat recovery vent that will save some energy. The simple way would be to open two windows and stick the fan in one for a short time (blowing in for turbulence to clear out the corners of the room). Leaving your windows open with passive circulation for a longer time is going to cool down all the stuff inside, wasting much more heat.