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The report outlines a methodology for calculating the biogenic carbon footprint of harvested wood products, moving away from the common assumption of carbon neutrality. It introduces the GWPbio approach, which accounts for the time lag between carbon emissions from harvesting and the subsequent sequestration during forest regrowth. The framework separates the impact into the 'forest carbon gap' (GWPbio, forest) and the benefits of delayed emissions through product storage (GWPbio, product), while also incorporating fossil carbon footprints. The methodology utilizes the Bern carbon cycle model to simulate atmospheric CO2 decay and provides specific growth and decomposition parameters for boreal forest (Norway spruce), Douglas fir, and Loblolly pine.