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19th century agriculture agro-industrial societies agro-industrialists America animals areas Aurignacian balance barbarians became become began Bronze Age Cato cattle cereals changes China Church climate concepts countryside course crops cultivated culture disease dominant early earth ecology economic emigration Empire England environment especially European eventually famine farmers farming feed fertile fertilisers fish followed food and civilisation food production food supplies forest France frost line fruits Gravettian growing harvest hectares Hesiod Homo erectus Homo sapiens human Human Zoo hunters hunting increased industry kind labour Lagash land living mainly Man's manure metal million modern natural needs Neolithic Age North Paleolithic pasture pattern peasants plants plough population possible potato practical primitive produce relatively Revolution rivers Roman slaves soil Spain survival Technological Age tended territory tion towns trade Upper Paleolithic Urukagina USSR Varro wealth western Europe western World wide