Pure oxgen can be created and destroyed by chemical reactions. Humans turn oxygen into carbon dioxide by using up energy and plants turn carbon dioxide into oxygen by photosynthesis (there are some other chemical involved in these processes too). If there are two many people on the planet and not enough plants then the oxygen would run out.
But we are a very very very long way from this, and probably we would run out of food first.
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wesaal786 commented on :
yay :—-)