Government policy Emigration and immigration 13 Economic aspects 12 Climatic changes 9 History 9 Women 8 Terrorism 7 Prevention 6 Social aspects 6 Industrial policy 5 Political aspects 5 Politics and government 5 Social conditions 5 Education 4 Employment 4 Environmental aspects 4 Immigrants 4 International cooperation 4 Law and legislation 4 Citizen participation 3 Commercial policy 3 Economic conditions 3 Energy policy 3 Environmental policy 3 Foreign relations 3 High technology industries 3 Information technology 3 International economic relations 3 Management 3 Nuclear nonproliferation 3