Climate change Environmental policy 216 Studies 194 Adaptation 118 Climatic changes 118 climate change 86 Global warming 78 Emissions 76 Climate 72 Environmental aspects 62 Greenhouse gases 61 Energy policy 60 Analysis 56 Agriculture 53 Emissions control 53 Politics 51 Carbon 46 Research 44 Greenhouse effect 42 Mitigation 41 Sustainable development 40 Environmental impact 35 Precipitation 35 Temperature 35 Migration 34 Environmental protection 33 Global temperature changes 33 Carbon dioxide 32 Energy efficiency 32 Economic growth 30