Related by context. Frequent words. (Click for all words.) 83 CO2 emissions 81 carbon dioxide emissions 79 carbon emissions 74 greenhouse gas emissions 72 emissions 72 reduce carbon emissions 71 CO2 70 greenhouse emissions 68 carbon emission 67 GHG emissions 67 greenhouse gases 64 carbon footprint 64 carbon dioxide 63 reducing carbon emissions 63 carbon dioxide CO2 62 greenhouse gas emission 62 Emissions 61 greenhouse gas 60 emission 59 emission reductions 58 carbon footprints 56 carbon neutral 56 carbon 56 emission reduction 56 GHG 54 NOx 52 mercury emissions 52 pollution 50 global warming 49 nitrogen oxide 49 nitrogen oxides 48 climate change 48 carbon offsets 47 zero emission 47 air pollution 47 heat trapping gases 47 fossil fuels 47 fossil fuel 45 carbon credits 45 environmentally friendly 45 reduce greenhouse gas 44 particulate matter 44 pollutants 43 biofuel 43 mpg 43 CO 43 renewables 43 environmental impacts 42 gas guzzling 42 biofuels 42 greener 42 polluting 42 congestion 42 burning fossil fuels 42 greenest 42 EVs 42 hydrogen powered 41 sulfur dioxide 41 Carbon dioxide 41 renewable energy 41 hydrogen 41 carbon capture 41 Carbon Trust 40 environmentally sustainable 40 acid rain 40 emitting 40 bioethanol 40 C# [001] 40 polluter 40 pollutant 40 #g/km [002] 40 emit 39 Climate Change 39 environmentally sound 39 alternative fuels 39 particulates 39 #mpg [002] 39 methane 39 kilowatt hours 39 bio diesel 39 gasses 39 bio fuels 39 water vapor 39 renewable 39 renewable energies 39 hybrid electric 38 hydrogen fuel 38 emitted 38 Hydrogen 38 gases 38 ozone 38 eco friendly 38 Global Warming 38 biomass 38 polluters 38 kWh 38 emitters 38 deforestation 38 diesel powered 38 VOCs 38 smog