Greenhouse effect, Atmospheric Global warming 14 Environmental aspects 12 Global temperature changes 8 Climatic changes 7 Environmental economics 5 Government policy 4 Emissions trading 3 Greenhouse gases 3 Pollution 3 Air quality management 2 Atmospheric carbon diocide 2 Environmental protection 2 International economic relations 2 Philosophy 2 Philosophy and science 2 Power resources 2 Radiation 2 Science 2 Atlases 1 Atmospheric effects 1 Carbon content 1 Carbon monoxide 1 Carbon sequestration 1 Economic aspects 1 Energy consumption 1 Infrared radiation 1 Social aspects 1 Soils 1 Solar radiation 1