20thcenturyamericanhistory analysis atmosphericscience biography britishlaw businesstaxes chicanos climatechange conservationinforestry conservationists conservationpolicies conservatism corporate corporateaccounting economicintegration economicpoliciesineurope economics educationpolicies engineering entrepreneurship environme environment environmentalact environmentalactivists environmentalcaselaw environmentalconservation environmentalimpact environmentallaw environmententalists europeanunion finance freetrade general globalwarmingpolicies government hazardouswastepolicies history humanecology humanity industrial industrialmanagement industrialpolicies infrastructure- laborpolicies latinopolitics liberalism meteorology mexicanamericans miscellaneous miscellaneousenvironmentalpolicies miscellaneouspollution naturalliterature naturalresources organizations politicalaspectsoftechnology politics pollutants pollution protection protectionofnaturalresources protectionpolicy regionalplanning regionalstudiesinenvironmentalscience relationshipwithnature science socialentrepreneurship socialresponsibilityofbusiness strategiesinenvironmentalconservation sustainabledevelopment techniques technologicalinnovations technologypolicy toxicology transferance unitedstatesarmy unitedstateshistory waterpollution