Related by context. Frequent words. (Click for all words.) 41 pollutants 40 emission reductions 38 greenhouse gases 38 Emissions 37 VOCs 36 heat trapping gases 36 greenhouse gas 36 mercury emissions 36 greenhouse gas emission 35 NOx 35 particulates 35 methane 35 emissions 35 pollution 34 GHG 34 sulfur dioxide 34 greenhouse emissions 34 air pollution 34 carbon dioxide CO2 33 particulate matter 33 greenhouse gas emissions 33 pollutant 33 nitrogen oxide 32 emission 32 ozone 32 soot 32 GHG emissions 32 nitrogen oxides 31 carbon dioxide 31 CO2 31 carbon dioxide emissions 30 Clean Air 30 tailpipe emissions 30 carbon emission 29 Kyoto Protocol 29 carbon emissions 28 CO2 emissions 28 coal fired 28 reduce carbon emissions 28 emission reduction 27 emit 27 EPA 27 emitters 27 fossil fuels 26 Environmental Protection Agency 26 Kyoto protocol 26 Copenhagen Accord 26 reducing carbon emissions 25 fossil fuel 25 biomass 25 cleaner burning 25 reduce greenhouse gas 24 emitting 24 CARB 24 tar sands 24 global warming 24 Renewable energy 24 burning fossil fuels 24 renewable fuels 23 gigawatts 23 UNFCCC 23 polluters 23 Climate Change 23 environmental impacts 22 retrofits 22 climate change 22 renewables 22 coal 22 Energy Efficiency 21 carbon capture 21 carbon 21 Kyoto 21 carbon credits 21 renewable energy 21 CDM 21 renewable 21 reducing greenhouse gas 21 emitter 21 mpg 21 renewable energies 20 polluter 20 Clean Energy 19 alternative fuels 19 carbon sequestration 19 biofuel 19 offsets 19 polluting 19 Climate Action 18 biofuels 18 deforestation 18 carbon offsets 17 legally binding 17 carbon footprints 16 EVs 16 retrofitting 16 reductions 15 carbon footprint 15 carbon neutral 13 REDD 13 zero emission 13 ETS