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The Value to Man of His Envi
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agriculture air pollution American artificial regimes balance cash changing man's traditions chlorinated hydrocarbons cities concerned consequence controlling nature costs course culture desalination destruction disease ecologic economic ecosys effect effort eighteenth century emphysema environment as problems erwise exist exploitation federal fish forest free is nature function Gougane Barra growth harm human demand increase industry investment irrigation lacking land law and environmental limits for man's man's future man’s manorial means measures ment natural resources needed nineteenth nomic numbers past pesticides plant population possible predictions present preserve produce programs protection purposes quick clay reason reforestation region René Dubos result risks river Robert Frost royal demesne runoff water scarcely seems sewer social soil sort sources species swamps techniques timber tion traditions about nature trees ture United urban-industrial civilization wardens waste York