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Human Calorie and Protein Needs and How Far They
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activity agricultural amount animals areas assumed authorities average become calories capital cause cent coal consider consumption continue costs countries course crisis demand density Department depends distribution economic effect energy England environment environmental estimate example expended factor famine Figure flow fuel future given Government greater growth head higher hospital human important income increase indicators individual industrial intake land less limited living London maintain material means measure meet methods million natural needs operate output particular period planning policies pollution population possible present priorities probably problems processes production protein question ratio recent reduced relation relative requirements rise river scale shows social society sources standard storage studies supply surveys Table towns transport unit urban