Related by context. Frequent words. (Click for all words.) 53 renewable energy 53 renewables 51 renewable fuels 51 alternative energies 48 alternative fuels 48 fossil fuels 48 greenhouse gas emission reductions 47 GHG reductions 47 renewable 47 biofuels 47 Renewable Portfolio Standards 47 fossil fuel 47 Renewable Electricity 46 corn ethanol 45 carbon emission reductions 45 energy 45 emission reduction 44 Fuel Efficiency 44 biomass geothermal 44 reducing carbon emissions 44 efficiency retrofits 44 bio fuels 44 reduce greenhouse gas 44 Renewable fuels 44 greenhouse gas emissions 44 reducing greenhouse gas 43 renewable energies 43 Andrew Kohut director 43 greentech 43 CAFE standards 42 greenhouse gases 42 cleantech 42 GHG reduction 42 Clean Energy 42 Pew 42 cleaner fuels 42 emission reductions 42 reduce carbon emissions 42 Drevna 42 greenhouse gas GHG 42 curbing carbon emissions 41 greenhouse emissions 41 Pew Charitable Trusts 41 website AARP.org 41 greenhouse gas 41 combating global warming 41 decarbonise 41 curbing greenhouse gases 41 SmartGrid 41 Renewable Portfolio Standard 41 Darrell Bricker 41 carbon emitting 41 #GW [002] 41 carbon dioxide emissions 41 Waxman Markey 41 carbon emissions 40 smart grids 40 FFVs 40 geothermal biomass 40 Waxman Markey bill 40 biomass 40 GHG emission 40 heat trapping emissions 40 Hydrogen Economy 40 biorefineries 40 Renewable energy 40 liquefied coal 40 economy 40 offshore wind 40 tailpipe emissions 40 CALSTART 40 efficiency 40 greenhouse gas emitting 40 Cellulosic ethanol 40 GfK polls 40 environmentalism 39 climate change 39 biofuel 39 wind turbines solar panels 39 greenhouse gas emission 39 regulatory frameworks 39 carbon sequestration 39 Daniel Yergin chairman 39 Lee Rainie director 39 initiatives 39 Joel Makower 39 ethanol 39 EPAct 39 Associated Press GfK poll 39 protectionist sentiments 39 Renewable Fuels Standard 39 emissions 39 burning fossil fuels 39 solar photovoltaics 39 renewable feedstocks 39 smart grid 39 emitting carbon dioxide 39 Venture capitalists invested 39 nonpartisan Pew Research 39 microgrids 38 Economically speaking