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Dear all,

I run into minus result CO2 ( Transportation of material).How can I solve this problem?
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This is not necessarily incorrect (if you have avoided products / system expansion, or uptake of CO2).

How can I solve this problem?

You can inspect where the CO2 is coming from (in contribution tree, impact analysis, or sankey diagram, and then see if this implementation is ok (maybe there are issues with the negative waste modeling in ecoinvent e.g.)