International cooperation Security, International 19 Environmental policy -- 18 International relations 17 Terrorism -- 16 Prevention -- 14 International economic relations 13 more ... Environmental aspects 12 Foreign relations -- 12 Economic development -- 11 National security -- 11 Environmental protection -- 9 Political aspects 9 Climatic changes -- 7 Economic policy 7 Law and legislation 7 Philosophy 7 World politics -- 7 Democracy 6 Economic conditions 6 Globalization 6 International relations -- 6 Terrorism 6 Democratization -- 5 Economic development 5 Economic policy -- 5 Foreign economic relations 5 International organization 5 Refugees -- 5 Commercial policy 4 less ...