I think the effect of CO2 is very similar to the hypoxia from low air pressure. Here's a video of a TV presenter and ex-member of parliament undergoing the experience.
The point of the scene is that you lose any faculties long before any unpleasantness or damage.
The point of the scene is that you lose any faculties long before any unpleasantness or damage.
https://www.youtube.com/watch?v=DiEJKvbpOF0
If I'm wrong, and this is completely irrelevant to the discussion, just try to enjoy seeing a Tory bought to the brink of oblivion [satire]