Related by context. Frequent words. (Click for all words.) 74 carbon dioxide emitted 74 CO2 emissions 71 CO2 71 carbon dioxide emissions 68 carbon emissions 67 carbon dioxide 64 carbon dioxide CO2 emissions 64 carbon dioxide CO2 63 carbon dioxide emission 62 greenhouse gasses 62 greenhouse gas GHG emissions 62 CO2 emission 61 GHG emissions 61 greenhouse gases 61 carbon emission 61 GHGs 61 greenhouse gas emissions 60 emissions 59 carbon footprint 58 greenhouse gas 58 reducing CO2 emissions 57 Carbon Dioxide 57 reduce carbon emissions 56 carbon 55 greenhouse emissions 55 reducing carbon emissions 54 emission 54 emitted 52 carbon footprints 52 NOx 51 GHG 51 fossil fuel 50 Emissions 50 greenhouse gas emission 50 emission reductions 49 exhaust emissions 48 carbon neutral 48 nitrogen oxides 48 Carbon dioxide 48 SO2 48 ecological footprint 48 emit 48 emitting 47 emission reduction 47 tailpipe emissions 47 nitrogen oxide emissions 47 water vapor 46 fossil fuels 46 VOCs 46 atmospheric CO2 46 nitrogen oxide 45 emits 45 methane 45 sulfur dioxide emissions 44 sulfur dioxide 44 pollution 44 burning fossil fuels 44 heat trapping gases 44 kWh 44 carbon credits 44 atmospheric carbon dioxide 44 Low Carbon 43 particulate matter 43 pollutants 43 carbon offsets 42 kilowatt hours 42 heat trapping greenhouse gases 42 carbon neutrality 42 hydrogen 42 polluting 42 Greenhouse Gas 42 BTUs 41 global warming gases 41 zero emission 41 pollutant 41 carbon sinks 41 combustion engine 41 gases 41 gasses 40 biogas 40 greenest 40 air pollution 40 biomass 40 refrigerant 40 particulates 39 CFCs 39 CO 39 polluter 39 biofuel 39 bioethanol 39 TWh 39 reduce greenhouse gas 39 mercury emissions 39 gigawatt hours 38 ozone 38 mercury pollution 38 absorb carbon dioxide 38 Emission 38 diesel powered 38 renewable 38 scrappage