Related by context. Frequent words. (Click for all words.) 88 carbon dioxide 85 carbon dioxide CO2 79 CO2 emissions 78 carbon dioxide emissions 74 carbon emissions 74 greenhouse gas 73 greenhouse gases 72 emissions 72 greenhouse gasses 70 carbon 69 carbon emission 68 greenhouse gas emissions 67 GHG 66 GHG emissions 66 emission 65 NOx 65 greenhouse emissions 64 Carbon dioxide 64 Emissions 62 methane 61 emission reductions 60 greenhouse gas emission 60 reduce carbon emissions 59 sulfur dioxide 58 gases 58 reducing carbon emissions 58 nitrogen 58 water vapor 57 emission reduction 57 fossil fuel 56 pollutants 55 nitrogen oxide 55 CO 55 hydrogen 55 nitrogen oxides 55 gasses 54 pollution 54 pollutant 54 VOCs 54 tailpipe emissions 53 fossil fuels 53 carbon sequestration 53 heat trapping gases 53 carbon capture 52 exhaust emissions 52 carbon footprint 52 biomass 51 ozone 51 refrigerant 51 Methane 51 mercury emissions 49 bioethanol 49 carbon credits 49 biofuel 49 air pollution 49 burning fossil fuels 49 combustion 48 particulate matter 48 global warming 48 Carbon 48 hydrocarbons 48 Nitrogen 47 carbon footprints 47 carbon offsets 47 sulfur 47 biofuels 47 mercury pollution 46 climate change 46 particulates 46 renewables 46 polluting 45 ozone layer 45 Hydrogen 45 CFCs 45 biogas 45 Climate 45 emitted 44 volatile organic compounds 44 aerosols 44 acid rain 44 VOC 44 carbon neutral 44 emitters 44 coal gasification 44 C# [001] 44 polluter 44 biosphere 43 coal fired 43 Global Warming 43 mercury 43 coal 43 bio fuels 43 nitrous oxide 43 syngas 43 vapor 43 sequestration 43 Kyoto Protocol 43 emitting 43 methanol 42 emit 42 hydrocarbon