Whatever the other failures of the U.S. government were, it had managed to print an excess of dollars which, combined with the collapse of trade and … - James Howard Kunstler

In the early twenty-first century farming had all but died out here. We got our food from the supermarket, and not everybody cared where the supermarket got it as long as it was there on the shelves. A few elderly dairymen hung on. Many let their fields and pastures go to scrub. Some sold out to what used to be called developers, and they'd put in five or ten poorly built houses. Now, […] there were far fewer people, and many houses outside [the] town were being taken down for their materials. Farming was back. That was the only way we got food.

Roman architecture would have been impossible without the complex socioeconomic platform of [the] empire. The medieval social platform for northern European life was less elaborate and… less complex. Compare these two historical cases with the complexity of social and economic organization that allows oil to be extracted from the ground, refined to gasoline, transported six thousand miles, and used in a highly engineered, fine-tuned machine called a car, [to be] driven on a six-lane freeway. If the social and economic platform fails, how long before the knowledge base dissolves? Two hundred years from now, will anyone know how to build or even repair a 1962 Chrysler slant-six engine? Not to mention a Nordex 1500 kW wind turbine? […] The existing knowledge in basic physics and chemistry is so widespread that it is likely to persist quite a while into the future and provide a foundation for doing more with less than, say, the people of the eighteenth century were able to do with their more limited knowledge.

Not to say that one would have to go back to a hunter-gatherer [or even a herbivore-insectivore] mode of existence in order to live on a solar budget. Pick any preindustrial culture you like, or pick the best or most relevant parts from any of them to get on with daily life, for instance, the habitations of Edo Japan, the division of labor of the Inca, the diet of the Florentines, the animal husbandry of Georgian England, the costumes of the Ming dynasty. Surely one could contrive life on a solar budget from these modes of daily endeavor and put together a satisfying existence that would amount to being civilized. Anyway, a great many of the useful inventions that made life comfortable and interesting were developed before we began using fossil fuels, quite a few of them in China alone. Add to that some additional knowledge that the human race has acquired since those historical periods, perhaps only the germ theory of disease, and you could enjoy a decent living standard.
Anyway, that’s a theory. History does run backward now and then, and the centers of civilization shift from one place to another, but we've never seen anything like what we face: the crash of a turbocharged cheap energy economy along with an ecological catastrophe perhaps beyond the biblical scale. History is also not symmetrical; you don’t necessarily go down the same way you came, recapitulating earlier arrangements in the same sequence backward. What we might get instead could be just a one-way ticket to Palookaville instead of getting to relive the sixteenth century.