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Originally Posted by strongmanmike
The other doozy is "CO2 is not a harmful gas, heck! plants breath it"
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Let's try to understand that. What they are saying is: "Because CO2 at 400ppm is non-toxic it also cannot be a problem in any other way." It's sort of like say: "Because water won't burn you, you also can't drown in it."
BTW Has anyone ever tried to breath pure CO2? I have and it hurts. You get a very sharp burning sensation in the nostrils, presumably from the CO2 combining with H2O to produce carbonic acid H2CO3.