Comment by jodrellblank

I love the question; James Lovelock came up with Gaia Theory, the idea that Earth was a self-regulating system, illustrated by a warming Earth evolving flowers which reflect more sunlight so they can stay cooler, and a cooling Earth evolving flowers which absorb more sunlight so they can stay warmer, which act to cool/warm the planet (sortof; IIRC). In one of his last books before he died (written at age ~100) he suggests that the warming and expanding Sun means there isn't enough time for Earth to re-evolve sentient life again.

We used oil that seeped out of the surface, and coal that was accessible by pick and shovel. That's become much harder to find now, we have to make floating oil rigs and drill kilometers under the Gulf of Mexico to extract oil, and ship it internationally to refine it. There's no way primitive people could do that again.

Buckminster Fuller was thinking about this 75 years ago when he came up with the idea of 'energy slaves', nicely illustrated by this online comic[2] about how much oil energy we use to keep modern comfortable civilisation going.

So I guess it depends how far the collapse goes! And whether there is heavy farming and earth moving machinery still around and the resources to fill them with biodiesel to pick up from existing farms and mines, and if there are nearly working industries to feed electricity into, or if we have to fall back to making charcoal from wood, or if we're back to a few remote tribes a few generations removed from anyone who lived in a high civilization with no knowledge of any of it or the languages used to write the rotting textbooks.

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

[2] https://www.stuartmcmillen.com/comic/energy-slaves/