Related by context. Frequent words. (Click for all words.) 52 renewables 52 emission reductions 52 reducing carbon emissions 52 fossil fuels 51 carbon sequestration 49 renewable energies 49 renewable energy 48 carbon emissions 48 emission reduction 47 greenhouse gases 47 reduce carbon emissions 47 greenhouse emissions 47 fossil fuel 47 greenhouse gas emissions 46 climate change 46 alternative energies 46 reducing CO2 emissions 46 biofuels 45 GHG emissions 45 PHEVs 45 Fossil fuels 45 carbon dioxide emissions 45 energy 45 GHGs 45 Greenhouse Gases 45 carbon emitting 44 GHG 44 reducing greenhouse gas 44 greenhouse gas concentrations 44 greenhouse gasses 44 carbon capture 44 greenhouse gas 44 CO2 44 combating global warming 44 geoengineering 44 CO2 emissions 44 renewable 44 global warming 44 greenhouse gas GHG emissions 43 smart grids 43 emissions 43 Waxman Markey 43 greenhouse gas emission 43 carbon emission 43 reduce greenhouse gas 43 environmentally benign 43 Renewable energy 43 alternative fuels 43 renewable fuels 42 carbon dioxide emission 42 carbon 42 emission 42 EVs 42 grid parity 42 HEVs 42 nuclear fission 42 carbon dioxide CO2 emissions 42 burning fossil fuels 41 atmospheric carbon dioxide 41 heat trapping emissions 41 Waxman Markey bill 41 cleaner fuels 41 bio fuels 41 Renewables 41 atmospheric CO2 41 biomass 41 carbon emitters 41 solar photovoltaics 41 CAFE standards 41 CO2 emission 41 externalities 41 extinctions 40 carbon dioxide 40 greenhouse warming 40 carbon neutrality 40 cleantech 40 cellulosic biofuels 40 retrofits 40 Kyoto Treaty 40 Greenhouse gases 40 gigatons 40 Greenhouse Gas Emissions 40 technological breakthroughs 40 NOx 40 bioenergy 40 combustion 40 sustainable 40 greenhouses gases 39 Greenhouse Gas 39 catalysis 39 coal gasification 39 emit carbon dioxide 39 ACEEE 39 heat trapping gases 39 Li ion batteries 39 baseload 39 Carbon Capture 39 HFCs 39 Rebalancing 39 Global Warming Solutions 39 liquid fuels