Related by context. Frequent words. (Click for all words.) 82 greenhouse gases 72 greenhouse gas emissions 68 greenhouse gas 67 carbon dioxide emissions 66 greenhouse emissions 65 emissions 64 carbon dioxide 64 carbon emissions 63 greenhouse gas emission 60 burning fossil fuels 60 emission reductions 58 mercury emissions 58 GHG emissions 56 carbon emission 56 carbon dioxide CO2 56 global warming 55 pollutants 54 emission reduction 54 emission 54 gases 54 GHG 53 CO2 emissions 53 CO2 52 fossil fuels 51 nitrogen oxides 50 emitters 50 reduce carbon emissions 50 tailpipe emissions 50 polluters 50 pollution 49 reducing carbon emissions 49 climate change 49 Carbon dioxide 49 sulfur dioxide 49 Emissions 48 nitrogen oxide 48 air pollution 48 methane 47 carbon 46 fossil fuel 46 pollutant 46 Kyoto Protocol 45 soot 44 deforestation 44 Copenhagen Accord 43 aerosols 43 reduce greenhouse gas 42 acid rain 41 polluter 41 atomic weapons 41 Climate Change IPCC 41 warming 41 industrialized countries 40 NOx 40 coal fired 40 nuclear arsenals 40 renewable fuels 40 particulate matter 40 mercury 40 poorer nations 39 Kyoto protocol 39 gasses 39 water vapor 39 Intergovernmental Panel 39 fissile material 39 polluting 39 ozone 39 biofuels 38 Global warming 38 reducing greenhouse gas 38 atmospheric 38 emitter 38 carbon sequestration 38 climate 38 suspend uranium enrichment 38 Environmental Protection Agency 38 Strategic Arms Reduction Treaty 38 toxic chemicals 38 renewable energy 38 smog 38 PFOA 38 nitrogen 38 renewables 38 EPA 38 coal 38 particulates 38 halt uranium enrichment 38 Yvo de Boer 37 carbon offsets 37 carbon credits 37 WMO 37 IPCC 37 industrialized nations 37 Kyoto 37 nuclear weapons 37 suspend enrichment 37 uranium enrichment 37 phytoplankton 37 ozone layer 36 Energy Agency 36 volatile organic compounds