We need to talk about the invisible deathtrap that is CO2 canisters

[2Green]

I am tired of this goddamn bullshit happening again and again. A guy drags a CO2 canister into a room, opens it, and leaves. Anyone who enters the room and stays there for even 10 seconds falls permanently unconscious and begins to suffocate to death. Anyone who tries to help the guy on the floor without realizing what's happening also falls unconscious and dies. There is absolutely no warning that it is about to happen. No gasping, no "O2" symbol in the top right, you just suddenly drop to the floor and never wake up. The only way to evade it is to be paranoid and walk around the station with your internals on all the time, no matter where you are.

To be clear, I am not complaining that you suffocate to death in an atmosphere that is 90% CO2. That just makes sense. What I am complaining about is that you have no warning whatsoever until you fall unconscious, at which point you are already dead unless a savvy crewmember with internals on knows what's going on and comes to your rescue. Please at least give us an 'O2' symbol so we know to put on our internals?

Thank you for coming to my TED Talk.