This is a little off topic, but it fits better in this thread than any of the others currently on the main page. Here is a quote from Ran Prieur about a week ago:
...a mind-blowing reddit comment on mythical oil:
In the future, even if there isn't a collapse, there will be no crude oil from the ground. Records will exist of it, but future people will have no material example of the substance our society runs on. Crude oil might be seen as a mythical, magical substance, something made up.
Corollary: what non-renewable resources might precursor civilizations have used up that we'll never know about? What "mythical" materials actually existed but don't anymore?
This is a thought that has occurred to me before as well.
In addition, Ran has another more recent link to Dmitry Orlov, in particular
this article. Orlov argues that we might think about transitioning to world where there are no high-energy resources left to sustain production of certain tools, by creating durable tools with the resources we have left, and passing them on as heirlooms to future generations. What Orlov does not talk about, however, is the resulting social stratification between the heirs of such tools and those who, for whatever reason, have become disinherited and divorced from all past.
Now, again, the corollary: what technologies have been passed down to certain families, about which the rest of us would know little about?
This question seems to touch on numerous RI themes.