Related by context. Frequent words. (Click for all words.) 88 greenhouse gases 84 greenhouse gas emissions 82 carbon dioxide emissions 81 carbon emissions 80 greenhouse gas 79 greenhouse emissions 76 carbon dioxide 76 emissions 75 CO2 emissions 74 GHG emissions 72 CO2 70 carbon emission 69 reduce carbon emissions 65 reducing carbon emissions 65 global warming 64 emission reductions 63 pollution 62 fossil fuels 62 mercury emissions 62 pollutants 61 Emissions 61 emission 61 carbon footprint 60 emission reduction 60 burning fossil fuels 60 climate change 59 air pollution 59 methane 59 fossil fuel 58 carbon 58 carbon footprints 57 pollutant 55 sulfur dioxide 52 deforestation 52 gases 51 reduce greenhouse gas 51 renewable energy 51 acid rain 51 biofuels 50 polluter 50 carbon sequestration 50 Global warming 49 carbon neutral 49 particulate matter 49 carbon offsets 49 polluting 49 biofuel 49 emitters 49 polluters 48 Global Warming 48 biomass 48 ozone 48 renewable fuels 48 water vapor 47 renewables 47 Kyoto Protocol 47 alternative fuels 47 environmental impacts 46 renewable 46 particulates 46 Methane 46 Climate Change 46 bio fuels 46 toxic chemicals 45 smog 45 reducing greenhouse gas 45 Climate 44 carbon credits 44 nitrogen 44 Renewable energy 44 carbon capture 44 renewable energies 44 energy 44 volatile organic compounds 44 ozone layer 44 aerosols 43 mercury 43 soot 43 coal fired 43 hydrogen 43 biodiversity 43 EPA 43 carcinogens 43 Kyoto protocol 42 landfills 42 pollute 42 CO 42 Environmental Protection Agency 42 methane gas 42 environmental 41 Kyoto 41 trans fats 41 oceans 41 Climate Action 41 emitted 41 hazardous chemicals 41 cleaner burning 41 warming 41 Pollution 41 ethanol 41 environmentally sustainable