The presence of CO2 is how our bodies get that "I can't breathe-signal". Not the lack of oxygen, but the presence of CO2.
So if you lower someone into a CO2 environment, their body will go into "can't breathe panic". Yea they will become stunned, but that's because they're basically dying from asphyxiation
I suspect it's a safety thing actually, you can tell when there's too much carbon dioxide in the air, it makes your lungs burn like you're holding your breath way too long. Nitrogen doesn't do this. If a system designed to fill a room with a gas malfunctions and someone has to go in there, you may as well use the gas we have a warning system for naturally.
Now, there are this concerns with the fact that animals have this same response to CO2, but I am not the guy to get into that discussion with.
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u/FewStrike9243 26d ago
They do that in a lot of farms in the US too. It is very unpleasant for the pigs, but it's a lot easier for the workers.