Since 2012, the GHG inventories unit, located within the Climate Change Office (OCC) of the Ministry of Environment (MMA) has designed, implemented and maintained the National System of Greenhouse Gas Inventories of Chile (SNICHILE). This system contains the institutional, legal and procedural arrangements established for the biennial update of Chile's NGHGI, thus ensuring sustainability in the preparation of GHG inventories in the country, the consistency of the GHG notified flows and the quality of the results. The SNICHILE is composed of teams from the Ministry of Energy. Ministry of Agriculture and MMA. The preparation of the current NGHGI began during the first semester of 2019 and ended halfway through 2020. at COP25 in Madrid, committing 2/3 of the world's countries (121 countries plus the EU), 12 regions, 389 cities, 789 companies and 14 financial institutions with more than 4 trillion USD in committed financial assets to Carbon Neutrality. During 2020 the Alliance continues under the leadership of Chile, the UNFCCC and the UNDP, strengthened by new countries that commit to Carbon Neutrality and with the incorporation of new Chile's NGHGI was prepared in accordance with the 2006 IPCC Guidelines for National Greenhouse Gas Inventories, and it encompasses the entire national territory. It includes emissions and removals of carbon dioxide (CO₂, and methane (CH₂), nitrous oxide (N₂O), hydrofluorocarbons (HFC, perfluorocarbons (PFC) and sulfur hexafluoride (SF) over the period from 1990 to 2018.