Guideline and Action Points
Selecting emissions factors and global warming potential values (for carbon equivalent GHG emissions) and estimating and aggregating data uncertainty for the calculation and reporting of GHG emissions.
- Select the calculation approach (either direct or indirect measurement) that will be adopted by the organisation for the calculation of GHG emissions.
- Selecting emission factors that are activity-specific to establish the carbon dioxide equivalent (CO2-e) emitted per unit of activity at the point of emission release.
- Select global warming potential (“GWP”) values to establish how much energy the emissions of one ton of any of the Greenhouse Gasses will absorb over a given period of time, relative to the emissions of 1 ton of carbon dioxide (CO2), to be expressed as carbon dioxide equivalent (CO2-e) emissions.
- Select the method for the calculation of GHG emissions (manual calculation, GHG Tools or commercial software).
- Calculate GHG emissions
- Select the approach to combining uncertainties, then estimate, rank and aggregate uncertainty
- Transfer the calculation method, emissions factors, GWPs, calculated emissions and estimated uncertainties to Section G of the company’s GHG Inventory Management Plan (IMP).
GHG Calculation Guidance and Calculation Tools