Climatic changes Government policy 9 Economic conditions 5 Economic policy 5 Environmental policy 5 History 5 Economic development 4 more ... Environmental aspects 4 International cooperation 4 Human geography 3 Politics and government 3 Social conditions 3 Terrorism 3 Air 2 Air quality 2 Carbon dioxide mitigation 2 Environmental conditions 2 Foreign relations 2 Greenhouse gases 2 Pollution 2 Social aspects 2 Climate 1 Consumption (Economics) 1 Economic aspects 1 Economic history 1 Effect of climate on 1 Energy development 1 Foreign economic relations 1 Global warming 1 Greenhouse gas mitigation 1 less ...