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this post was submitted on 26 Jul 2025
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You wouldn't survive very long. The oxygen level was insanely high back then, and for some reason very high oxygen levels can make you go blind if you breathe the air for too long. Also it would have got unimaginably cold at night even in the tropics (virtually no greenhouse gases) so you'd probably freeze to death.
But also you'd starve to death because there would be nothing to eat since fruit and vegetables wouldn't have yet evolved.
You would probably have better luck surviving on an alien planet than Earth several hundred million years ago.