What's going on that made dilapidated buildings get overrun by plantlife? Is it massive depopulation? Are we idealizing that?
those were the factories where the now retired subjects of the art built all their green energy tech and they don't need it any more. A highly automated communist society wouldn't have the same pressures driving population growth as modern capitalism with all it's racist crying about demographics, maybe the birth rate goes down over time, maybe it stabilizes over several generations. I don't think a deliberate program of reducing human population is reasonable (especially with any current government) but I also don't think we should be attached to "8 billion and growing" either.
or maybe the farmers are weirdos and everybody else is living in cool cities with trains and bodegas. Division of labor isn't fascism.