Enough and to Spare: Mother Earth Can Nourish Every Man in Freedom

adequate America amount animal annual average barrels bodies capital cent century changes citizens coal concerning continue countries decades demand democracy democratic directed earth economic efficient equal essential estimated Europe existence fact fertilizers fields figure foreign freedom future geologic Germany greater human hundred ideas important increase individual industry intelligent iron Italy Japan known land lead least less LIGNITE limited lines live mankind materials means metals methods million mind mineral mining nature necessary needs operation opportunity organization petroleum placed planning plants political population possible potential practical present principle probably processes production progress reach reason recent regimentation region representatives requirements reserves responsibility result rocks scientific social society soil sources supply thought tion tons trend United utilization