Wood and more generally any vegetal biomass, thanks to photosynthesis, capture CO2 during the growth of the plant; this carbon is generally called “biogenic carbon”. By capturing this CO2, the vegetal biomass can help to mitigate the effects of global warming. This effect is taken into account in the global warming indicator calculated as part of the life cycle assessment. Thus, for the production stage of the product, negative figures may be observed (“A1-A3” stages of the FDES or PEP). Wood construction therefore appears to be a solution for storing carbon during the life of the construction work. But when wood is used to produce energy (wood energy, energy recovery from wood waste) and at the end of life of the building, it re-emits all or part of this CO2, therefore, we use the term temporary storage. The NF EN 15804 +A2/CN standard (and the future PCR ed 4 for PEP) has defined the accounting rules allowing the upstream capture and various re-emissions of greenhouse gases to be taken into account throughout the life cycle, especially at the end of life. In order to meet the requirements of the ELAN law, an indicator of biogenic carbon storage in buildings is implemented by the RE2020 environmental regulation. Therefore, to meet this requirement, it is necessary that the environmental declarations of construction products and equipment specify the quantity stored during the service life of the product. This quantity must be expressed in kgC/FU. This field is now in place on INIES
