Describes CO2 emissions per unit of fuel; biomass is regarded to have an emission factor of zero.
An emission factor is a unique value for scaling emissions to activity data in terms of a standard rate of emissions per unit of activity (e.g., grams of CO2 emitted per liter of fossil fuel consumed). Emission factors allow GHG emissions to be estimated from a unit of available activity data. Emissions factors are sometimes referred to as emission conversion factors (CDP, 2014)
A factor that converts activity data into GHG emissions data (e.g., kg CO2e emitted per liter of fuel consumed, kg CO2e emitted per kilometer traveled, etc.). (WRI, 2013)