You and Your Car
— Check Your Car's Carbon Dioxide Score
— Calculate Your Personal Carbon "Footprint"
— Calculate Your CO2 Emissions for a Single Trip
— Find the Annual Greenhouse Gas Emissions of your Vehicle

Top Rated Carbon Offset Providers
— NativeEnergy
— TerraPass
— AgCert (Ireland)
— atmosfair (Germany)
— Carbon Neutral Co. (UK)
— Climate Trust (US)
— MyClimate (US)

Top Rated Cheating Offset Providers
— CheatNeutral

Articles on Carbon Offsets
— Ten Personal Solutions from the Union of Concerned Scientists
— Transportation Offsetting News Updates
— Ways To Make Your Transport More Sustainable
— Guide to Sustainable Transportation (PDF)
— Economic Action to Stop Global Warming

Other Resources
— Global Warming: An Overview from Union of Concerned Scientists
— The Consumers Guide to Carbon Offsetting (PDF)
— New Internationalist Issue devoted to Carbon Offsetting
— Carbon Offsets Demystified
— How to Buy a Carbon Offset
— What is a carbon offset?
— Go Carbon Neutral
— An Inconvenient Truth
— Climate Counts
— The Alliance for Climate Protection