它们分别是全球煤炭储量第一和第二大国。
Mountaintop removal mining is considered the fastest, most cost-effective way to mine coal reserves.山巅移除采矿被认为是最快最省钱的采煤方法。
Put another way: humanity can only afford to burn and vent less than one quarter of known oil, natural gas and coal reserves.换一种表达方式:人类只可以燃烧和释放已知石油、天然气和煤储量的四分之一。