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The GWP values used in in Envizi’s emission factors are dictated by the various reporting frameworks from which we source our factors.
Some factor sources provide factors in term of each of the 3 main gases (CO2, CH4 and N2O) in their unconverted form (eg. US EPA Climate leaders), while most other factor providers (eg. UK DEFRA, AU NGERS, NZ EPA, etc.) incorporate the preferred GWP values directly into emission factors they publish which means all gases are reported in CO2e.
Australia’s NGERs protocol adopted AR5 back in 2020 while UK DEFRA only adopted AR5 in 2023 and US EPA has finally adopted AR5 in their 2024 factors.
Reporting guidelines generally adopt the GWP values being used for global emissions reporting at that time. Best practice is to use the assessment report according to the reporting guidelines. This ensures that emissions reports by different organizations are comparable rather having different organizations adopting different assessment reports for their reporting.
The structure of Envizi’s factors follows the most common international approach where all factor information is recorded in CO2-equivalents. This means all managed factors are configured using a specific set of GWP values that cannot be changed based on client preferences.
If a client wishes to use GWPs from a different IPCC Assessment report (eg. AR6 instead of AR5) than the one used for any of our managed factors they can do so by creating and managing their own custom factors.
NOTE - For factor sets where the GWP values are incorporated directly into the published factors this would require reverse engineering values and re-applying alternate GWPs to create new factor information.
GWPs for Refrigerants and Synthetic Gases
Envizi does provide the option for clients to override the GWP used for refrigerants and synthetic gases by applying a specific assessment report set of factors (AR4, AR5, AR6) via a managed factor set (assuming they still have a free slot in their factor set selection hierarchy). If using the override approach for refrigerants the GWP values are applied for refrigerants regardless of time frame.