CO2 buildup can also cause a blackout, but it is far less common than a low O2 blackout, because CO2 blackouts cannot occur during breath-holds at atmospheric pressure--if you want to experience a CO2 blackout, you either need to do apnea at extreme depth (and stay there), or you need to inhale pure O2 at the surface, and neither are recommended!
If you just do apnea at atmospheric pressure, you will blackout from low O2 long before your CO2 level reaches 'blackout' danger levels....
Eric Fattah
BC, Canada
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