Select and document emission factors with source, geography, year, unit, and owner.
Emission factors are assumptions under control. The basic equation is simple: activity data times emission factor equals emissions. The professional work is making sure the factor actually matches the activity. A therm of natural gas, a gallon of diesel, a passenger-mile flight estimate, and a kWh of purchased electricity each need a factor with the right unit and boundary. Match before multiplying Check unit, geography, year, gas coverage, and whether the factor is direct-only or includes upstream effects. A factor for UK electricity cannot quietly stand in for a US eGRID subregion. A factor for diesel combustion is not the…
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