Excellent.
I think the idea that humans can destroy the earth or even the ecosystem is a bit over rated. When Mt Toba exploded about seventy five thousand years ago it was an explosivity index of eight. That would be quite a few GIGA tons of explosive equivalent. Lots and lots more than all the nukes on earth put together.
Like I said...excellent post.
Thank you, I appreciate you comment. Interesting details!
This topic is very close to the theme of "filters" in the Fermi paradox,
but that's a subject for separate discussion!
I'm a sci-fi writer. I try to keep my science real. Lately I've had occasion to research 'extinction events' (earth has had at least five and possibly as many as twenty) When Toba blew (many gigaton) it was no big deal....compared to one of the extinction events.
People don't seem to have any idea of scale. The biosphere of earth is as relatively thick as a film of water on an apple. (about ten miles vs about 8K miles)