Related by context. Frequent words. (Click for all words.) 92 carbon dioxide emissions 92 greenhouse gas emissions 89 CO2 emissions 87 emissions 86 greenhouse emissions 85 carbon emission 85 greenhouse gases 82 reduce carbon emissions 80 GHG emissions 79 greenhouse gas 74 CO2 74 carbon 72 carbon footprint 71 carbon dioxide 71 emission 70 emission reduction 69 Emissions 64 climate change 63 global warming 63 mercury emissions 62 pollution 60 fossil fuels 60 carbon neutral 58 fossil fuel 56 air pollution 55 carbon credits 54 renewable energy 54 renewables 53 reduce greenhouse gas 53 burning fossil fuels 52 Climate Change 52 emitters 52 polluters 52 pollutants 51 biofuels 50 Climate Action 50 reducing greenhouse gas 50 carbon capture 49 polluting 49 Climate 49 Kyoto Protocol 49 biofuel 48 renewable 48 zero emission 48 environmental impacts 48 deforestation 48 sulfur dioxide 47 greener 47 pollutant 47 Kyoto 47 environmentally friendly 46 Carbon 46 alternative fuels 46 coal fired 45 biomass 45 methane 44 energy 44 ETS 44 environmentally sustainable 44 particulate matter 44 greenest 44 offsets 44 climate 44 acid rain 43 renewable fuels 43 gases 43 Global Warming 43 environmental sustainability 42 Clean Energy 42 environmental 42 coal 42 environmentally sound 42 renewable energies 42 soot 41 Energy Efficiency 41 Clean Air 41 congestion 41 emit 41 Copenhagen 41 environmentally responsible 41 Sustainability 41 Global warming 41 smog 41 pollute 40 eco friendly 40 EVs 40 greening 40 sustainability 40 sustainably 40 EPA 40 ozone 39 tar sands 39 environmentally conscious 39 Pollution 39 environmentally 39 Environmental Protection Agency 39 efficiency 39 hydrogen fuel 39 CO 39 biodiesel 39 smart grid