Related by context. Frequent words. (Click for all words.) 91 greenhouse gas emissions 86 emissions 86 carbon emissions 84 greenhouse gases 83 carbon dioxide emissions 78 GHG emissions 77 CO2 emissions 76 carbon emission 76 reduce carbon emissions 76 greenhouse gas 74 emission reductions 71 emission reduction 69 emission 68 Emissions 65 CO2 64 mercury emissions 64 carbon dioxide 64 carbon 63 pollution 62 global warming 61 climate change 60 carbon footprint 58 air pollution 58 fossil fuels 57 reduce greenhouse gas 56 carbon footprints 55 polluters 55 burning fossil fuels 55 Kyoto Protocol 55 emitters 55 fossil fuel 54 pollutants 54 reducing greenhouse gas 54 renewables 53 renewable energy 52 Kyoto protocol 52 Kyoto 52 carbon neutral 51 biofuels 51 polluter 51 pollutant 50 Climate Change 49 carbon capture 49 renewable 49 renewable fuels 48 polluting 48 biofuel 48 Climate Action 48 deforestation 47 carbon offsets 47 sulfur dioxide 47 zero emission 46 carbon credits 46 alternative fuels 45 acid rain 45 EPA 45 renewable energies 45 coal fired 45 particulate matter 45 ozone 45 Renewable energy 44 Climate 44 Global Warming 44 methane 44 environmental impacts 44 gases 43 Clean Air 43 smog 43 biomass 43 Global warming 42 bio fuels 42 environmentally sustainable 42 greener 42 environmentally friendly 41 Environmental Protection Agency 41 Pollution 41 environmentally sound 41 environmental sustainability 41 tar sands 41 ETS 41 Climate Change IPCC 41 ethanol 40 soot 40 nuclear arsenals 40 nitrogen 40 biodiversity 40 particulates 40 climate 40 environmental 40 pollute 40 Copenhagen 40 Energy Efficiency 39 toxic chemicals 39 Clean Energy 39 energy 39 ozone layer 39 coal 39 mercury 39 gigawatts 39 greenest 39 cleaner burning