Related by context. Frequent words. (Click for all words.) 81 reduce carbon emissions 77 carbon emissions 74 greenhouse gas emissions 74 greenhouse emissions 73 reducing greenhouse gas 72 carbon dioxide emissions 72 CO2 emissions 68 reduce greenhouse gas 68 emissions 68 emission reduction 67 greenhouse gases 67 carbon emission 66 emission reductions 66 GHG emissions 64 greenhouse gas 62 climate change 60 renewable energy 60 renewables 58 CO2 58 GHG 57 carbon neutral 57 carbon footprint 56 global warming 56 carbon 55 carbon dioxide 55 fossil fuels 55 carbon footprints 54 emission 54 biofuels 53 fossil fuel 53 renewable 53 zero emission 52 Emissions 52 renewable energies 52 alternative fuels 51 environmental sustainability 50 greener 50 environmentally friendly 50 Climate Change 49 biofuel 49 renewable fuels 48 Renewable energy 48 carbon capture 47 environmentally sustainable 47 Kyoto Protocol 47 sustainable 47 sustainability 47 pollution 46 mercury emissions 46 bio fuels 46 Kyoto protocol 46 efficiency 46 EVs 45 emitters 45 energy 45 Renewables 45 Climate Action 45 carbon offsets 44 biomass 44 Energy Efficiency 44 greening 43 Sustainability 43 carbon sequestration 43 Kyoto 43 burning fossil fuels 43 environmentally sound 43 reducing 43 pollutants 43 air pollution 43 environmentally responsible 43 environmentally conscious 43 Clean Energy 42 polluter 42 hydrogen powered 42 Copenhagen 42 greenest 42 polluting 42 pollutant 41 bioenergy 41 carbon credits 41 polluters 41 climate 41 eco friendly 41 achievable 41 Climate 41 environmental stewardship 40 cleaner burning 40 smart grid 40 conserving 40 halving 40 achieving 40 sustainably 40 coal fired 40 hydrogen fuel 40 hybrid electric 39 cellulosic ethanol 39 biodiesel 39 Hydrogen 39 environmentally 39 Renewable Energy 39 retrofitting