@8petros a lot of books (like the Gamechanger, A Half Built Garden) put the "old capitalists" as the villains, but I would be more subtle and not cast any people or groups there. I would cast traits. Technosolutionism. Fanaticism. Purism.
When I wrote https://alxd.org/solarpunk-rpg-factions.html , I made the factions purposefully problematic, so that each one could generate some problems.