Related by context. Frequent words. (Click for all words.) 90 carbon dioxide emissions 89 carbon emissions 83 greenhouse gas emissions 82 emissions 79 CO2 79 GHG emissions 78 carbon emission 77 greenhouse emissions 76 reduce carbon emissions 75 greenhouse gases 72 reducing carbon emissions 71 carbon footprint 71 greenhouse gas 69 emission 69 carbon dioxide 68 greenhouse gas emission 68 Emissions 67 carbon dioxide CO2 66 emission reductions 66 carbon footprints 65 emission reduction 64 carbon 63 GHG 61 NOx 57 mercury emissions 57 pollution 55 nitrogen oxide 55 carbon neutral 55 nitrogen oxides 54 global warming 54 air pollution 53 heat trapping gases 53 fossil fuel 52 fossil fuels 52 climate change 51 zero emission 50 pollutants 50 renewables 49 burning fossil fuels 49 carbon offsets 48 environmentally friendly 48 particulate matter 48 polluter 48 polluting 47 environmental impacts 46 pollutant 46 reduce greenhouse gas 46 renewable energy 46 bioethanol 46 carbon credits 46 efficiency 45 biofuels 45 biofuel 45 kWh 45 sulfur dioxide 45 VOCs 45 Climate Change 44 emitters 44 greenest 44 Energy Efficiency 44 EVs 44 greener 43 consumption 43 renewable 43 Kyoto 43 Carbon dioxide 43 polluters 43 bio fuels 43 Kyoto Protocol 43 internal combustion engine 43 deforestation 43 carbon capture 43 #g/km [002] 43 gases 43 renewable energies 43 biomass 42 eco friendly 42 Carbon 42 emit 42 mpg 42 diesel 42 Climate 42 kilowatt hours 42 environmentally sound 42 methane 42 emitted 42 gas guzzling 42 emitting 42 alternative fuels 41 reducing greenhouse gas 41 diesel powered 41 particulates 41 environmental sustainability 41 carbon sequestration 41 Clean Air 41 gasses 41 hydrogen 41 Kyoto protocol 41 environmentally sustainable 41 Climate Action 41 eco