But as these stocks rapidly decrease a new study has shown that natural gas, mainly methane, could be found deeper, within the Earth in the mantle.

• 随着这些能源的储量迅速地枯竭，人们开始把目光投向地球更深处。一项研究表明，天然气(主要成分是甲烷)有可能存在于地球深处的地幔之中。