That's why it's in quotes, to highlight that sarcasm mode is engaged in response to certain environmental activists labeling CO2 as an environmental toxin. That's funny, 'cause plants breath CO2. But they labelled it a toxin in order to allow the EPA to regulate its production in the US.
Therefore, "Unnatural".
Well, respectfully, plants don't breathe, first off.
Secondly, anything is toxic in high enough quantity, save for the inert gases. As well, CO2
is demonstrably toxic to
humans, this is why our cells release it and it is then respired. Whether that ideology is concurrent with your belief structure is not the point, at 1% you're drowsy and at 8% of total volume, you're unconscious and dead. Is it something that should be regulated based on its' concurrent toxicity in humans......I would say no. We'll lower the acidity of the ocean to 7.0 before CO2 becomes inherently toxic to human life, which will collapse everything else first.
Oxygen, past 35% at 1.2 atm gains toxicity, and at 100% at one atm, within 48 hours you start a pulmonary failure cascade. As partial pressure increases/decreases so does the relevant toxicity factor. If the partial pressure falls under 1, (astronauts breathe 100% O2 at .6 atm for weeks) the problems go away.
Seriously, no offense meant in any way. I was just surprised to see what you wrote. You seem more with it than that, sarcasm or not.
