GHG Inventory Management

Step 1 - Establish Organisational Boundary
Step 2 - Establish Organisation Boundary
Step 3- Reporting Period and Activity Data
Step 4 - Calculate GHG Emissions
Step 5 - Managing Inventory Quality
Step 6 - Climate Commitment and Target Setting
Step 7 - Report GHG Emissions
Step 8 - Verification of GHG Emissions

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.

Action points

  1. Select the calculation approach (either direct or indirect measurement) that will be adopted by the organisation for the calculation of GHG emissions.
  2. 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.
  3. 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.
  4. Select the method for the calculation of GHG emissions (manual calculation, GHG Tools or commercial software).
  5. Calculate GHG emissions
  6. Select the approach to combining uncertainties, then estimate, rank  and aggregate uncertainty
  7. 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



IPCC Worksheets