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this post was submitted on 08 Aug 2024
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Science Memes
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A time traveler's survival guide. The vertical green bars are the only times in Earth's history with enough oxygen to breathe (hypoxia) and low enough to avoid oxygen toxicity (hyperoxia):
https://fedia.io/media/cache/resolve/entry_thumb/fa/a9/faa97017c09ebf7d9543fece447951844e5cfbdaa9f491c95763102e987ffc59.jpg
That blue bar is extremely pessimistic. Humans can survive pretty well with 15% oxygen, and do so in several places in the Andes mountains, China and India. I wouldn't recommend doing it without lengthy acclimatizing, especially not considering my last paragraph, but it's completely survivable by itself.
Humans also don't really have a problem with 25% oxygen, although that will definitely bring down the life expectancy.
On the other hand, note how those pointers talk about giant insects, megafauna and other scary things. Those are a much bigger problem than the air you're breathing.
why?
Oxygen is really rough on the DNA due to making the cells "rust" which hampers cell division and/or increases risks of mutations or cancers
So those memes that were "warning" that oxygen was dangerous because it created rust in metal rods is actually true ??
Yeah, and for the same reason it rusts metal.
https://www.harvardmagazine.com/sites/default/files/html/1999/03/health.html
https://en.m.wikipedia.org/wiki/Oxidative_stress
https://scitechdaily.com/researchers-discover-how-too-much-oxygen-can-cause-lasting-health-problems-in-humans/