The Closing Circle: Native, Man & Technology

activities agricultural air pollution algae algal amount animals atomic automobile bacteria Barry Commoner basic become biological birth rate capita carbon dioxide cent changes chemical complex cost course crop cycle death rate degradation detergents developing displaced earth ecological economic system ecosphere ecosystem effects emissions energy engine environment environmental crisis environmental pollution eutrophication example fallout fertilizer nitrogen fibers fish hazard human humus increase industry inorganic Lake Erie living things materials ment mental mercury modern technology molecules nations natural nitrate nitrogen fertilizer nitrogen oxides nonreturnable nuclear power nutrients operation organic compounds organic matter over-all oxygen pesticides phosphate photochemical smog plastic political pollution levels pollution problem population growth postwar private enterprise system production profit quotation radiation radioactive recent reduced reported result scientific scientists sewage smog soap social soil strontium 90 sulfur dioxide surface waters survive synthetic synthetic fibers tion United yield