The 2006 IPCC Guidelines for National Greenhouse Gas Inventories (2006 IPCC Guidelines) which were published in 2006 provide methodologies for estimating national inventories of anthropogenic emissions by sources and removals by sinks of greenhouse gases. This IPCC Methodology Report titled the 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories (2019 Refinement) was published in 2019 to refine the 2006 IPCC Guidelines with the aim to provide an updated and sound scientific basis for supporting the preparation and continuous improvement of national greenhouse gas inventories.