Funny, but animals get along fine using natural sources of renewable energy, as did Native Americans before the European invasion of North America.
The day will come when we will realize that modern technology is only the effort to make more of less, and the less being almost always of inferior quality.
And that there is a limit to how much can be made from a diminishing supply of resources.
Most Native Americans had a standard of living not much better than stone age neanderthals. Thirty years old was old to them. Even the most advanced societies before modern power had 95% of their people doing subsistence farming, tied to a spot of land for their whole lives performing back breaking work until they couldn't do it any more and then died.
I'd still like to shoot for a higher standard of living. At least until I die. Then the rest of you can live like feudal peasants if you want.
“And that there is a limit to how much can be made from a diminishing supply of resources.”
The problem with your reasoning is that we do not face a diminishing supply of resources.
As a practical matter, our resource base is unlimited for at least hundreds of thousands of years.
The earth does not limit our resources.