Why would it ever happen that the oxygen in the air would become so low that human beings cannot breathe it?
The answer may or may not be overly complicated to you.
The oceans produce at least 50% of the Earths oxygen. This is made possible by living organisms in the oceans, micro organisms like Plankton and Phongfgggus. The mix of aquatic life it takes to produce 50% the Earths oxygen is a constantly active ecosystem and vulnerable to atmospheric disruption.
Hypoxia is when a patch of ocean water becomes so low in oxygen that life cannot thrive in it. Suppose half the ocean is hypoxia then we lose 25% air quality.
Anoxia is when the ocean bodies have no oxygen and dead zones.
Or something.
One reason why the Earth would fastly plummet air oxygen levels would be that oceans become warmer than cooler in years like, the Plankton melt pretty quick, hypoxia and anoxia everywhere, it’s oceanic genocide, all of a sudden the air quality is bad. Then the surface air oxygen levels suffer because there aren’t enough hugs for trees.
“When I get a lil older and I’m getting ready to leave, I am going to put air in a bag and charge people to breathe.” ~Marshal Mathers, Rapper
https://www.sciencedirect.com/science/article/pii/S2590332220300014
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