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).

@j4k3 · edit-2 5 months ago

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).

@[email protected] · 5 months ago

Thanks! I’ve always wondered about this. From the comments though, it sounds like there’s a few caveats with what “breathable” really means. Very very interesting.