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As I knew, "Oxygen on Earth primarily came about through the process of photosynthesis performed by ancient bacteria called cyanobacteria, which released oxygen as a byproduct while using sunlight to convert carbon dioxide and water into energy, marking a significant event known as the "Great Oxidation Event" where oxygen levels in the atmosphere began to rise significantly; this process occurred roughly 2.4 to 2.3 billion years ago."

That's how Oxygen concentration rose from 1% to 21 % (was even higher).

That's a huge, huge amount! And may not even require regular “replenishment” and production of “new oxygen”.

And in the present days - The waters (oceans) of the world are the main oxygen generators of the biosphere; their algae are estimated to replace about 90 percent of all oxygen used.

Again- as I know- plants produce O2 in a day (light) time (photosynthesis)... And in the night time they "consume" >50% of released O2)))) And they emit CO2 in the night)) They "breath"! (That is why "Nature" emits >200Gt of C per year (750Gt CO2) - and sequester the same amount!!

So, it's complicated:::))))

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What you have written is a good example to see how incommensurate scientific theories become when placed next to each other. The same also can be said about conflicting data and numbers, which eventually makes no sense, when we look at reality. The reality of what? Of oceans (warming and swelling with heat). The reality of forests and jungles (becoming sources of carbon and NOT sinks as earlier). The reality of the biosphere, water bodies, rivers and oceans, destroyed and loaded with toxic elements, all because of human beings. Instead its so much easier to recall some far-gone “Great Event”. First we turn Nature on its head, and then comes science to explain it all. HaHa Not Complicated At All.

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