Which method pack is recommended to be used with the ecoinvent Database from nexus the openLCA LCIA Methods or the ecoinvent methods that are already included in the database?
It depends what you want. With the ecoinvent methods, you will get the exact same results as from ecoQuery, but the methods are not regionalized and you can only use them with the corresponding ecoinvent database. With the openLCA methods package, other database from Nexus can be compatible (not all), for example Agribalyse, and some of the methods included are regionalized so that you can get regionalized LCIA results if you want.
So I guess the biogenic removals in the openLCA LCIA Methods are only displayed as a positive value?
This is only an issue of conventions. You can say that the impact category name includes "removals", so it is already clear that the result must be a removal from the air and the absolute value would be sufficient here. The absolute value would represent here the removal of biogenic carbon. The ISO 14067 method also has an impact category for the biogenic emissions, so you have a total (absolute) value for biogenic emissions and a total (absolute) value for biogenic removals.
In, for example, EF 3.1 you have only "Climate change (biogenic)" which can be positive or negative. Also the openLCA methods make use of the impact direction feature. Inside the explicit "removal" category in ISO 14067, we could simply change the CFs of the only two flows "Carbon dioxide, in air" and "Carbon dioxide, non-fossil, resource correction" to -1, but then it is not the same CFs as used in total (where it has to be 1 because of the impact direction feature which automatically subtracts the input flows in the total impact category). Let us know if you think that is is more consistent to also set the "removal" category negative. It is a quick change and only an issue of convention / how to report the results, since the naming already implies a "removal".
Best wishes,
Conrad
