Environmental aspects -- Environmental policy -- 9 Economic aspects -- 5 Congresses 4 Agriculture -- 3 Congresses -- 3 Economic development -- 3 more ... Environmental aspects 3 Environmental protection -- 3 Government policy -- 3 Natural resources -- 3 Social aspects -- 3 Climatic changes -- 2 Developing countries -- 2 Economic conditions -- 2 Economic policy -- 2 Energy policy -- 2 International trade -- 2 Pacific Area 2 Petroleum industry and trade -- 2 Agriculture and state -- 1 Asia 1 Biological warfare -- 1 Case Studies 1 Case studies 1 Case studies -- 1 Chemical spills -- 1 Chemical warfare -- 1 Clothing trade -- 1 Commerce -- 1 less ...