Liquefied natural gas is a fossil fuel that is super-cooled to -260°F, at which point it reaches a liquid state and is highly compressed to about 1/600th its volume as a vapor. LNG is mostly methane, and may also contain small amounts of ethane, propane, butane, and heavier hydrocarbons, as well as carbon dioxide and sulphur. It was first exported from Algeria, which continues to be one of the major suppliers today. It is also exported from Trinidad, Qatar, Nigeria, Oman, Malaysia, the United Arab Emirates, Siberia, Indonesia, and other countries.