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Re:536 was ‘the worst year to be alive’ (2018) by vbezhenar on Friday June 19, 2020 @03:25AM (#23571967)
In case of apocalypsis, debris of our civilization will provide huge supplies of metals. Much cheaper to process than raw ore.

Coal is a different thing. That said, I think that it's not necessary to have very cheap coal and oil energy to have technological advances.

Re:536 was ‘the worst year to be alive’ (2018) by trevyn on Friday June 19, 2020 @12:15PM (#23575894)
Ahhh that’s why we haven’t met the aliens yet, they’re waiting for us to extract all the metals.