Just wanted to share my opinion. I'm not sure if the number of existential threads for humanity is now larger than 200k years ago. My take would be it is probably much smallest than even 1k years ago. Nukes will not destroy civilization (it might be horrible disaster on the scale of WW2 but not civ. distruction.). Arguably we are now have better ways to adapt to climate changes and it or meteorite impact. And who knows, in another 100 years we might be an interplanetary species. AI might not be a thread like some suggests, and the up sides to productivity are enormous.