'''Natural gas''' is a [[gas]]eous [[fossil fuel]] consisting primarily of [[methane]] but including significant quantities of [[ethane]], [[butane]], [[propane]], [[carbon dioxide]], [[nitrogen]], [[helium]] and [[hydrogen sulfide]] | '''Natural gas''' is a [[gas]]eous [[fossil fuel]] consisting primarily of [[methane]] but including significant quantities of [[ethane]], [[butane]], [[propane]], [[carbon dioxide]], [[nitrogen]], [[helium]] and [[hydrogen sulfide]] |