What is the difference between "IPCC 2021 GWP100" and "IPCC 2021 GWP100 (incl. CO2 uptake)" in dealing with biogenic carbon dioxide and biogenic methane?

The method "IPCC 2021 GWP100" excludes CO2 uptake and biogenic CO2 emissions, following IPCC recommendations. The uptake and emissions of biogenic CO2 are part of a short cycle and have net zero impact. Biogenic methane emission, however, is accounted for. The biogenic methane is corrected for the biogenic CO2-uptake that was not taken into account in this method (and biogenic methane has therefore a lower characterization factor than fossil methane).
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The method "IPCC 2021 GWP100 (incl. CO2 uptake)" includes both CO2 uptake and biogenic CO2 emissions. The characterization factor of biogenic methane in this method is no different than that of fossil methane. Please note that also when using this method the uptake and emissions of biogenic CO2 are part of a short cycle and have net zero impact. The only reasons for deviations over a full life cycle are when other biogenic carbon substances (like methane) are released or when biogenic carbon is (temporarily) sequestered in an intermediate material applied in a next product life cycle.
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For more information on how these methods have been implemented in SimaPro, please check the Methods manual .
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