minus-squareCikos@lemmy.worldtoCool Guides@lemmy.ca•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).linkfedilinkEnglisharrow-up28·14 days agoeven earth feels like an alien planet millions of years ago, imagine if advanced space faring civilization do probe earth and categorized it to be inhospitable before, during and after their civilization crumbled to dust. linkfedilink
even earth feels like an alien planet millions of years ago, imagine if advanced space faring civilization do probe earth and categorized it to be inhospitable before, during and after their civilization crumbled to dust.