Related by context. Frequent words. (Click for all words.) 69 greenhouse gases 68 heat trapping gases 61 greenhouse gasses 58 burning fossil fuels 58 greenhouse gas emissions 57 greenhouse emissions 56 carbon emissions 56 carbon dioxide emissions 56 global warming gases 56 carbon dioxide 55 greenhouse gas 52 fossil fuels 51 emissions 49 greenhouse gas emission 48 carbon dioxide CO2 48 carbon emission 48 global warming 47 gases blamed 47 pollutants 47 reduce carbon emissions 47 GHG emissions 47 reducing carbon emissions 46 Carbon dioxide 46 atmospheric carbon dioxide 45 mercury emissions 45 CO2 emissions 45 emission reductions 45 polluters 44 emitters 44 methane 43 CO2 43 climate change 43 pollution 43 emission reduction 43 mercury pollution 43 Emissions 43 gases 42 sulfur dioxide emissions 42 fossil fuel 42 emission 41 reduce greenhouse gas 41 GHG 41 polluting industries 41 Kyoto Protocol 41 tailpipe emissions 40 regulate greenhouse gases 40 nitrogen oxides 40 pollutant 40 carbon 40 acid rain 40 Outer Continental Shelf 40 Montreal Protocol 39 Climate Change 39 sulfur dioxide 39 nitrogen oxide 39 aerosols 39 fissile material 39 air pollution 38 water vapor 38 Global warming 38 polluter 38 atomic weapons 38 industrialized countries 38 Copenhagen Accord 37 Developing nations 37 Global Warming 37 Climate Change IPCC 37 polluting 37 cleaner burning 37 IPCC 36 electric utilities 36 poorer nations 36 deforestation 36 Kyoto accord 36 renewable fuels 36 soot 36 nuclear weapons 36 oceans 35 renewable energy 35 climatologists 35 enriched uranium 35 nuclear warheads 35 renewables 35 polar regions 35 Kyoto protocol 35 melting glaciers 35 alternative fuels 35 pollute 35 nitrogen 35 atmospheric 35 emerging economies 35 emitter 35 renewable energies 35 Deforestation 35 reducing greenhouse gas 35 Climate 35 Energy Agency 34 UN Intergovernmental Panel 34 enriching uranium 34 coal 34 boreal forest