Related by context. Frequent words. (Click for all words.) 79 CO2 Emissions 75 Greenhouse Gas Emissions 67 Greenhouse Gases 66 Greenhouse Gas 65 Emissions 64 Fuel Costs 63 Offsets 63 Carbon Offset 63 Carbon Offsets 61 Carbon Dioxide 61 Reduce Emissions 61 Hybrid Cars 61 Ethanol Production 60 Fossil Fuels 60 Carbon Reduction 59 Commodity Prices 59 Slower Growth 59 Emissions Reduction 58 Price Hikes 58 Weak Dollar 58 Toxic Chemicals 58 Heating Costs 58 Fuel Efficiency 57 Fuel Consumption 57 Recession Fears 57 Emission Reduction 57 Improve Efficiency 57 carbon emissions 57 Carbon Footprint 57 Stronger Dollar 56 Risk Appetite 56 Stimulus Spending 56 Hidden Costs 56 Cut Costs 56 Interest Rates 56 Prices Climb 56 Economic Slowdown 56 Inflation Fears 56 Traffic Congestion 56 Emerging Economies 56 Rate Cuts 56 Flight Delays 56 Privacy Concerns 56 CO2 55 GHG 55 Reduce Costs 55 Gas Mileage 55 GHGs 55 Reduce Debt 55 Coal Fired Power 55 Weaker Dollar 55 Carbon Credits 55 GHG emissions 55 Weak Economy 55 Pollutant 55 Housing Slump 55 CO2 emissions 54 Increase Productivity 54 Cell Phone Use 54 carbon emission 54 Gasoline Prices 54 Carbon Sequestration 54 Cost Savings 54 Volcanic Ash 54 Step Towards 54 Rate Increases 54 Fossil Fuel 54 carbon dioxide emissions 54 Economic Woes 54 Carbon Neutral 54 Prices Surge 54 greenhouse gas GHG emissions 54 Nuclear Plants 54 Trade Pact 54 Stocks Soar 54 Gaining Momentum 54 Cellulosic Ethanol 54 Tax Breaks 53 Climate Change 53 Rate Hikes 53 Longer Term 53 Cost Reductions 53 Experts Urge 53 Plastic Bags 53 Oil Prices Slip 53 Fuel Surcharge 53 Help Small Businesses 53 Operational Efficiency 53 Fuel Efficient 53 Proposed Changes 53 Costs Rise 53 Supply Chains 53 Pressure Mounts 53 Storage Capacity 53 Improve Quality 53 Helps Businesses 53 Co2 emissions 53 Economic Optimism 52 Scaled Back 52 greenhouse gas 52 Gas Prices