煤炭的英语单词是 coal。它的来源是拉丁语的 "煤炭"，原意为 "燃烧的木头"。

例句：

We use coal to generate electricity. (我们用煤炭来发电。)

Burning coal produces a lot of pollution. (燃烧煤炭会产生大量污染。)

The use of coal has been declining in recent years due to concerns about climate change. (由于对气候变化的担忧，近年来煤炭的使用量一直在下降。)