This is just not true. We are changing the earth in ways that is killing existing life but we are not threatening the existence of life or humanity as a whole. No matter what happens humans will adapt and life will evolve to fill new niches.
Reverting to low-tech after civilizational collapse... that one seems far too plausible to me.
And we've used up loads of the easily-accessed coal and oil. industrial revolution 2.0 may not actually be feasible.
https://en.m.wikipedia.org/wiki/Archean
https://en.m.wikipedia.org/wiki/Permian–Triassic_extinction_...
While what is happenings is extremely bad for our perception of what life is like, life itself has been through much worse.
I’m not particularly eager to see humanity extinguished or the world reset into another age. But if it happens, life won’t be gone from the universe even if there’s only life here on earth.
Nature might, who knows? And maybe we are just “programmed” to feel our own importance, and thats perhaps necessary but not sufficient to save us.