Carbon dioxide emission trends in cars and light trucks: A comparative analysis of emissions and methodologies for Florida's counties (2000 and 2008)

► The paper evaluates GHG emission methods for on-road passenger vehicles in Florida. ► The paper compares methods that assume the harmonic average with actual VMTs driven. ► The paper analyzes statewide GHG emissions aggregated by county for 2000 and 2008. ► The paper improves on methods that balance bottom-up with top-down GHG emissions.