Pull your head out, there are no sustainable options that scale. Food production alone takes up something like 70% of the dry land surface of the planet. permac

Pull your head out, there are no sustainable options that scale. Food production alone takes up something like 70% of the dry land surface of the planet. permaculture/sustainable ag produces at max a third of the calories per acre of modern monocrop ag. So unless you're planning on raising Atlantis a severe reduction in global population is a hard requirement to transition food production to sustainable methods because we dont have the spare acreage required.