We could have pre-industrial civilizations that arise on Earth if we exhaust the natural resources. I imagine that we have enough scrap metal lying around to n

We could have pre-industrial civilizations that arise on Earth if we exhaust the natural resources. I imagine that we have enough scrap metal lying around to not prohibit post-disaster civilizations from working with metal. It’s really a matter of how bad the ecological disaster is, I can imagine a point where it’s bad enough to cause a collapse of our current civilizations but not bad enough to prohibit smaller less technologically advanced civilizations.