You really do need to look at WWII rationing and agriculture in Britain. It was, in gross, probably the lowest meat-eating period in recorded British history, with land use optimised to maximise feeding the population with the essentials. Yet both rationing and agriculture encountered problems that your posts do not consider. PFH touches on the rationing problem, which may sound flippant, but is a major obstacle to making it work. And while the mass vegetising of British agriculture did feed more people for the land used, it was enabled by unusually inclement weather, land was used that was unsuitable for the purpose, and the land was exhausted after several years of intensive production, exacerbated by lack of regeneration through manuring.
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