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Im trying to determine the impact between the process obtention of a biocarbonized mineral material with or without energetic integration, but some indicators are negatives with Recipe Midpoint H, this is possible ? what does this mean ?

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It is up to you so check where the negative contributions in the toxicity results comes from.

However, toxicity categories often give negative results if biomass is involved, since biomass absorbs heavy metals from the soil during cultivation. In a cradle to gate scenario it is then a sink (and usually it is also not considered in its end of life). This can result in negative toxicity values.