[Ruy Dias de Bivar]

Co2 is necessary for your health! If you breathe too fast you hyperventilate because of too much oxygen as opposed to co2 in your lungs. You can pass out from this.

You must then breathe into a paper bag and inhale that co2 laden air to get the amounts of co2 vs oxygen in your lungs in proper balance.

[ballplayer]

Not to mention it Promotes Plant Growth so we all dont starve to death