Anthropology. A confusing mix. Different theories, perspectives. All become confusing. Rule by ideas. Dogma, doctrine. People have ideas about how society ought to be. Ideological wars. Persecution. Wars of ideas. Different world views. Different universes.
The eco-sphere. The bio-sphere. Societal and industrial collapse. Resource depletion. Collapse of technology and telecommunications systems. Collapse of modern medicine and manufacturing. Steady state world. Steady state technology.
People try to go back to living in the wild but fail. A culture without meaning. The rich live in bunkers underground.