Hi Erwin,
I’m afraid I don’t understand what you mean by ‘the “negative” GWP from the carbon neutral material will be higher than the value in the EPD’. Can you send through screen shots?
By the way, please note that a product that is only ‘carbon neutral’ because they have paid for ‘carbon offsets’ does not align with EN15978. If you wish to model these EPDs, we recommend that you don’t model them in your headline LCAs but model it as a ‘Scenario’ design option instead like we have outlined in this support post for renewable power puchase agreements.
