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Hej

I have encountered something strange that I hope to get help with. I updated my software (I use a Mac) to the 1.9 version and ran the same product system as using the old version using the same method (CML (baseline) [v4.4 January 2015]) for GWP 100 and the results are very different. I had a back up since November 2018 and running the product system using the CML method provided by open LCA results in a 4 times higher GWP100 compared to running it with the updated version (I ran both today as a comparison). I have an input of softwood, and it seems as the difference in climate impact is origin from a large negative climate impact for the growing of the trees. However, it differs from about -2 kg CO2 eq. running my old version to -12 kg CO2 eq. running it today. I have tried to compare the impact assessment methods and the characterisation factors and I cannot find any difference, however there is something called carbon scenario that I cannot understand.

Do you know why there is such a large difference using the same method for the same system? using Ecoinvents CML method or IPCC2007 between the two versions don't seem to lead to any changes?
in openLCA by (710 points)
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You use exactly the same database with openLCA 1.8 and openLCA 1.9 on macOS and get different results, right? Do you calculate the results in a project? If yes, maybe this issue is related: https://ask.openlca.org/2213/issue-openlca1-9-compared-product-systems.
Could you also test the 1.10.1 version from http://www.openlca.org/download/ > Latest build. Thanks!

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