During times of high oxygen content, the animal kingdom of the planet grows to a larger average size. During times of high co2 content, plant life grows to a larger average size and in turn creates more oxygen. More plants or larger average size of plants both equate to more co2 use and more o2 being put back into the atmosphere. As I have said, mother nature is not so easily tricked, even at the hands of man........
At one point, in early early times, the earth's atmosphere became 80-90% oxygen due to algeas flurishing on the high co2 content that was available previously. When it started to drop, they credit that with the reason why many of the giant flying animals went extinct. They were too big an unable to respire properly as the O2 levels dropped....this was the before the mass extinction...or...when God decided to create Man...whichever you believe
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