Environmental aspects -- Economic aspects -- 7 Environmental policy -- 6 Congresses 5 Economic development -- 4 Environmental protection -- 4 Climatic changes -- 3 more ... Environmental aspects 3 Natural resources -- 3 Chemical warfare -- 2 City planning -- 2 Climate changes -- 2 Conservation of natural resources -- 2 Deforestation -- 2 Developing countries -- 2 Energy policy -- 2 Environmental aspect -- 2 Foreign economic relations 2 Forest fires -- 2 Global environmental change -- 2 Government policy -- 2 History 2 Industrial management -- 2 International trade -- 2 Persian Gulf War, 1991 -- 2 Political aspects -- 2 Security, International -- 2 Social aspects -- 2 Sustainable development -- 2 Agriculture -- 1 less ...