Those advocating the end of fossil fuels and nuclear energy might want to read up on humanity’s previous regressions into statist society:

"The Dark Ages were a massive experiment in the back-to-the-land hippy lifestyle (without the trust fund): you ground your own corn, sheared your own sheep, cured your own leather and cut your own wood. Any pathetic surplus you generated was confiscated to support a monk, or maybe you could occasionally sell something to buy a metal tool off a part-time blacksmith. Otherwise, subsistence replaced specialisation." (Matt Ridley, The Rational Optimist)