Related by context. Frequent words. (Click for all words.) 65 Fossil Fuels 57 Cellulosic Ethanol 56 Fight Global Warming 56 Hydrogen Economy 55 Ethanol Production 54 Hydrogen Fuel 54 Carbon Emissions 54 Global Warming 53 CO2 Emissions 52 Carbon Offsets 52 Million Gallons 52 Coal Fired Power 52 Hybrid Cars 52 Carbon Sequestration 51 Biodiesel Production 51 CO2 Capture 51 Greenhouse Gases 51 Biofuel 50 Polluter 50 Hydrogen Storage 50 Tax Hikes 50 Peak Oil 50 Carbon Dioxide 50 Uranium Enrichment 49 Carbon Credits 49 Oil Spills 49 Renewable 49 Farm Subsidies 49 Tax Incentives 49 Energy 49 fossil fuel 48 Feedstocks 48 Greenhouse Gas Emissions 48 Nuclear Waste 48 Greenhouse Gas 48 Pollute 48 Climate Talks 48 Ayoon wa Azan 48 Gas Mileage 48 Moving Towards 48 Nuclear Reactors 48 Mountaintop Removal 47 Stimulus Spending 47 Cellulosic 47 Emissions 47 Alternative Fuels 47 Lithium Ion Batteries 47 Shale Gas 47 Geoengineering 47 Heating Costs 47 Nuclear Plants 47 Clean Coal 47 Ramping Up 47 Natural Gas Vehicles 47 Fuel Economy 47 Carbon Reduction 46 Pave Way 46 Carbon Capture 46 Auto Bailout 46 Irrelevance 46 Distort 46 fossil fuels 46 Greenhouse Effect 46 Biofuels 46 Emissions Reduction 46 Minimum Wage Increase 46 Op Ed Columnist 46 Low Emissions 46 Nuclear 46 Debunked 45 Trans Fat 45 Reduce Emissions 45 Carbon Offset 45 Light Bulbs 45 Hybrid Vehicles 45 Offsets 45 Bioethanol 45 Sustainably 45 Renewable Energy 45 Stimulus Funding 45 Biochar 45 Clean Energy 45 CLIMATE CHANGE 44 Deniers 44 Greg Pollowitz 44 Per Gallon 44 Retrofits 44 Supercritical 44 Secondhand Smoke 44 Alternative Fuel 44 Fuel Efficient 44 Toxic Chemicals 44 Fuel Efficiency 44 Zero Emissions 44 Fuel Consumption 44 Climate 44 Ethanol 44 Greenhouse Gas Reduction 44 Water Purification 44 Prospering 44 Refrigerant