Government policy Terrorism -- 11 Prevention 8 Emigration and immigration -- 6 Prevention -- 6 Climatic changes -- 3 Environmental aspects 3 more ... Global warming -- 3 Refugees -- 3 Democracy 2 Economic aspects 2 Government policy -- 2 Greenhouse gas mitigation -- 2 Immigrants -- 2 Aboriginal, Australians -- 1 Alien labor -- 1 British -- 1 Civil right -- 1 Climate change 1 Climate changes -- 1 Climatic changes 1 Competition, International 1 Counterinsurgency 1 Cyberspace 1 Cyberspace -- 1 Drug traffic -- 1 Economic development -- 1 Environment responsibility 1 Ethnic relations -- 1 Ethnicity -- 1 less ...