Somewhat off topic, the proper method for rodent euthanasia via CO2 involves introducing the CO2 at very low quantities, thereby lowering the O2 levels. This causes the rodent to lose consciousness without pain as you described. After the animal is unconscious, you 'flood' the chamber with CO2, which kills it. When I gas my rodents they do not show signs of distress. They don't gasp or cringe or show any of the very obvious signs of discomfort or distress. I have seen it done improperly and agree 100% that it's awful.
CO2 is used widely in the pharmaceutical industry, which is one of the most strictly regulated and highly scrutinized industries out there. Using 24 point bold font to try to force your misinformation down people's throats doesn't contribute to the topic.
As to the comment about 'how do we know they feel anything' ... I won't be touching that with a 10 foot pole. It only takes a handful of brain cells to recognize utter gibberish.
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