In accordance with the ISO standard 14067 (Greenhouse gases - Carbon footprint of products - Requirements and guidelines for quantification), the product carbon footprint can be quantified partially within the cradle-to-gate system boundary or fully as cradle-to-grave by including all life cycle stages. A systematic illustration of the different system boundaries can be found in the following figure.
-png.png?width=2726&height=1174&name=Systemgrenzen_eng%20(1)-png.png)
In addition, all relevant greenhouse gases are quantified in accordance with the current IPCC Assessment Report (AR6). Currently they are presented as total sum in CO2 equivalents (CO2e). Going forward, the emissions - if available - are also broken down into individual gases (CO2, CH4, N2O, HFC, PFC, SF6, NF3), which enables more precise analyses and differentiated reporting. Going forward, total emissions are also reported separately for fossil and biogenic CO2.
As required by the ISO 14067, the Climate Hub also provides information on data quality, accuracy and verifiability. This is described in the general accounting section.
Going forward, the results are summarised in a separate PDF report that transparently documents both the methodological assumptions and the key results. The emission factors used, including their sources, are also disclosed. This provides users with a reliable basis for climate reporting, product comparisons or external communication. It should be noted that a comparison of different PCFs is only possible if the functional unit and system boundaries are defined identically.