+1 vote
I have noticed that when I include the elementary flow: emissions to air-"carbon dioxide" (no subcategory) it does not show up in the impact assessment, only in the inventory, however if I change it to carbon dioxide, fossil, it shows up. Why is it so? What are the characterisation factors for carbon dioxide (I looked into the eco invent LCIA metods and they mention 3 carbon dioxide emissions;  biogenic, fossil and land transformation, does this mean that I need to be extra careful to chose one of these three wen modelling?)
in openLCA by (790 points)
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2 Answers

+2 votes
by (790 points)
Turns out this was due to a difference between the ecoinvent impact assessment method and the one from openLCA, which I guess I should have thought of. For example in the ecoinvent version of CML 2001 only "carbon dioxide, fossil" and "carbon dioxide, from soil and biomass" seems the be included. The open LCA version also includes "carbon dioxide", "carbon dioxide, biogenic", "carbon dioxide, land transformation" and "carbon dioxide, in air".

Mystery solved
by (260 points)
Hi Frida,
Then, in the version of CML 2001 just can include the elementary flow "carbon dioxide, fossil" and "carbon dioxide, from soil and biomass" ?
+1 vote
by (81.6k points)
Hi Frida,

I assume you are assessing GWP? The ecoinvent methods are provided by us "as is", i.e. as they are provided by ecoinvent. We will, today or tomorrow, release an own, updated and expanded package for LCIA methods, which we extensively tested. From what you report, not all CO2 flows are characterised in the category you are assesssing.

Best wishes,