An issue that likely spans repositories, in the new GHG FBS and the import factors datasets, we have a flow for "HFCs and PFCs, unspecified" in the units of kg CO2e. However this is not a flow that exists in any of the impact assessment methods so it shows as having a characterization factor of 0 in the C matrix.

We need to figure out the cleanest way to make sure flows like this get characterized in impact assessment.