Comment by alexey-salmin

Can you expand more on what these things are?

Life on earth survived both the Cryogenian period with 5°C mean surface temperature [1] and Paleocene–Eocene thermal maximum with esimated 27.2–34.5°C mean surface temperature [2]. For comparison the current mean temperature is 15–16°C, the preindustrial was approximately 14°C.

I'm not even sure it's easy to exterminate humanity: our species has displayed an extreme ability to adapt. Surely, billions of humans could die in a big cataclysm but it's genuinely hard to imagine an event that will exterminate every last pocket of survivors. Even harder if we speak roaches and bacteria. The "lifeless rock" will happen when the sun turns into the red giant.

[1] https://en.wikipedia.org/wiki/Cryogenian

[2] https://en.wikipedia.org/wiki/Paleocene–Eocene_thermal_maxim...