Related by context. Frequent words. (Click for all words.) 66 carbon emitting 59 polluting 58 CO2 emission 57 CO2 emissions 56 carbon dioxide emission 54 emission 54 carbon emission 53 fossil fuel 53 carbon dioxide emissions 53 emissions 51 carbon dioxide CO2 emissions 51 carbon emissions 50 GHGs 50 CO2 49 reduce carbon emissions 49 greenhouse gas emissions 49 fossil fuels 48 diesel 48 cleaner fuels 48 zero emission 48 exhaust emissions 48 greenhouse gas emitters 48 EVs 47 renewables 47 greenhouse emissions 47 carbon 47 particulate emissions 46 greenhouse gas emission 46 reducing carbon emissions 46 emitting 46 greenhouse gasses 46 tailpipe emissions 46 diesel powered 46 reducing CO2 emissions 46 gas guzzling 46 environmentally damaging 46 GHG emissions 45 gas guzzling cars 45 emission reduction 45 greenhouse gases 45 environmentally friendly 45 emitters 45 diesels 45 greenhouse gas 45 coal fired 44 internal combustion 44 gas guzzling vehicles 44 renewable 44 greenhouse gas GHG emissions 44 diesel engines 44 PHEVs 44 internal combustion engine 44 polluter 44 biofuel 44 polluting industries 44 biofuels 44 Emissions 43 alternative fuels 43 renewable energies 43 gas guzzler 43 carbon dioxide CO2 43 cleaner greener 43 gas guzzling SUVs 43 renewable energy 43 IGCC 43 combustion engine 43 bio fuels 42 carbon dioxide 42 cleaner burning 42 bioethanol 42 emission reductions 42 nitrogen oxide emissions 41 gas guzzlers 41 electrically powered 41 bio ethanol 41 nitrogen oxide 41 carbon footprints 41 carbon footprint 41 bio diesel 41 Toyota Prius 41 hybrid electric 40 NOx 40 pollutant 40 hybrid powertrain 40 polluters 40 supermini 40 greenest 40 compressed natural 40 carbon dioxide emitted 40 renewable fuels 40 baseload 40 environmental friendliness 40 coal 40 #g/km [002] 39 global warming gases 39 PHEV 39 biomass 39 CAFE standards 39 hatchbacks 39 fuels 39 mpg