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Current criteria to define managed forests are inconsistent among countries’ reports of GHG emissions to UNFCCC. Integrated assessment models used for assessing countries’ mitigation pathways employ a proxy for managed forests that differ from the countries’ criteria. This is one of the reasons for the gap of 5.5 GtCO₂ year⁻¹ between the modelled and reported global land-use GHG emissions. Using multiple data, we developed a map of managed forests (0.5 × 0.5 deg), consistent with official GHG inventories. We applied the map in the G4M model for masking a managed forest area and estimating the GHG emissions from that area.