Related by context. Frequent words. (Click for all words.) 92 carbon emissions 91 greenhouse gas emissions 90 CO2 emissions 87 emissions 86 greenhouse gases 83 greenhouse emissions 80 GHG emissions 79 carbon emission 79 greenhouse gas 79 reduce carbon emissions 78 carbon dioxide 78 CO2 71 emission 70 Emissions 69 mercury emissions 67 emission reduction 66 carbon 65 carbon footprint 63 pollution 62 air pollution 60 global warming 59 pollutants 59 fossil fuels 58 fossil fuel 57 climate change 56 burning fossil fuels 55 sulfur dioxide 55 carbon neutral 54 renewable energy 54 renewables 53 reduce greenhouse gas 52 particulate matter 52 biofuels 52 pollutant 51 coal fired 50 methane 50 polluters 50 carbon capture 50 biofuel 50 zero emission 50 carbon credits 49 emitters 49 polluting 49 renewable 49 gases 48 reducing greenhouse gas 48 alternative fuels 47 Climate Change 47 renewable fuels 47 biomass 47 environmentally friendly 46 Clean Air 46 Climate Action 46 environmental impacts 46 acid rain 46 ozone 46 Kyoto Protocol 45 gigawatts 45 deforestation 45 kilowatt hours 45 renewable energies 45 soot 44 bio fuels 44 hydrogen 44 smog 44 energy 44 cleaner burning 44 Climate 44 emit 43 coal 43 hydrogen fuel 43 emitted 43 greener 43 Kyoto 43 mercury 42 Energy Efficiency 42 biodiesel 42 greenest 41 volatile organic compounds 41 environmental 41 ethanol 41 EPA 41 diesel 41 Carbon 41 nitrogen 41 EVs 41 offshore wind 41 Environmental Protection Agency 41 environmentally sound 41 diesel powered 41 congestion 40 internal combustion engine 40 kWh 40 emitting 40 toxic chemicals 40 water vapor 40 CO 40 environmentally sustainable 40 Clean Energy 40 efficiency 40 gas guzzling