• Tar_Alcaran@sh.itjust.works
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      3 months ago

      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.

    • PeriodicallyPedantic@lemmy.ca
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      3 months ago

      I’m super skeptical of this.

      You don’t get oxygen toxicity, even breathing pure oxygen, unless you’re under significantly more pressure than atmospheric pressure…

      So either this graphic is wrong/misleading, or the atmosphere was more than double current pressure for most of earth’s history… Which I’m pretty skeptical of.