Also Called: Methane;Methane or natural gas but excluding refrigerated liquid methane or natural gas;Natural Gas;Methan;GAS NATURAL LICUADO;NATURAL GAS WITH A HIGH METHANE CONTENT, COMPRESSED;MARSH GAS;METANO COMPRIMIDO Y CRIOGENICO;METHANE, REFRIGERATED LIQUID (CRYOGENIC LIQUID);Methane (gas);METHANE OR METHANE, COMPRESSED;Methane (liquid);NATURAL GAS, LIQUID (REFRIGERATED) WITH A HIGH METHANE CONTENT;GASES, SIMPLE ASPHYXIANTS: METHANE;Methane, which has the molecular formula CH4;Aliphatic hydrocarbon gases alkanes (C1-C3) Methane;metaani