To understand why CO2 in our blood is actually necessary, for our biochemistry to work right, please read https://www.kobo.com/us/en/ebook/breath-28

THIS is why the slow-deep breaths of yoga are actually optimal.

One's breathing has more effect on one's blood-CO2 than does the air's CO2-levels, obviously.

The deterioration of our breathing-habits goes along with the deterioration of our fitness, our posture, our absence-of-chewing ( thanks to processed-foods ), etc.

That is an important book.

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At this point there's so much shit going and going downhill that adding one more thing to the list makes literally no difference anymore

Quite the opposite, all these little cracks in the dam, each one further accelerates the collapse

Thanks for the recommendation. I'll give it a read. 🫡