Related by context. Frequent words. (Click for all words.) 90 greenhouse gas emissions 87 greenhouse gas 86 carbon dioxide emissions 85 carbon emissions 84 greenhouse emissions 83 emissions 81 carbon dioxide 76 GHG emissions 75 CO2 emissions 73 CO2 73 carbon emission 69 emission reductions 69 reduce carbon emissions 68 global warming 67 mercury emissions 67 emission 66 emission reduction 66 Emissions 66 burning fossil fuels 65 pollutants 65 carbon 65 pollution 64 fossil fuels 64 climate change 63 air pollution 61 fossil fuel 59 pollutant 59 methane 59 gases 58 sulfur dioxide 58 polluters 57 emitters 54 reduce greenhouse gas 54 polluter 54 Kyoto Protocol 53 carbon footprint 52 biofuels 51 renewable energy 51 acid rain 51 Climate Change 51 particulate matter 50 deforestation 50 renewables 50 ozone 50 reducing greenhouse gas 50 carbon footprints 50 soot 50 carbon offsets 50 carbon sequestration 49 renewable fuels 49 smog 49 polluting 49 coal fired 49 Climate 48 carbon credits 48 biofuel 48 carbon capture 48 Global warming 47 Kyoto protocol 47 nitrogen 47 mercury 47 Clean Air 47 Kyoto 47 biomass 47 carbon neutral 47 renewable 46 water vapor 46 alternative fuels 46 Climate Change IPCC 46 EPA 46 Global Warming 46 Methane 46 toxic chemicals 45 particulates 45 climate 45 oceans 45 coal 45 renewable energies 44 cleaner burning 44 energy 44 Environmental Protection Agency 44 ozone layer 44 volatile organic compounds 44 Climate Action 44 Renewable energy 44 zero emission 43 aerosols 43 bio fuels 43 IPCC 43 hydrogen 43 carcinogens 43 ethanol 43 Pollution 42 pollute 42 environmental impacts 42 warming 42 emit 41 emitter 41 industrialized countries 41 methane gas 41 environmentalists