its not just that. carbon monoxide will bind to your blood the same way oxygen does, but it takes magnitudes more energy to unbind that oxygen. co2 doesn't do t

its not just that. carbon monoxide will bind to your blood the same way oxygen does, but it takes magnitudes more energy to unbind that oxygen. co2 doesn't do that. In a closed room co2 can build enough to make you feel tired headaches etc. The same amount of carbon monoxide in the room would just kill you