The coal it produces is mostly poor in quality and rich in ash; it should be washed before shipping to make it more efficient, but is not.

它所产的煤炭大部分质量差而灰尘多；要想提高这些煤炭的效率，在装运之前应该要清洗但它们并没有被清洗过。

youdao

It is a moon landing that must be replicated daily at thousands of coal plants in hundreds of countries - many of them poor.

这一“登月”必须每天重复发生在上百个国家的成千上万的燃煤电厂中，其中许多是贫穷国家。

youdao

They also tend to produce poor-quality coal which generates relatively high levels of pollution when burned.

他们也倾向于生产劣质煤，这些煤在燃烧时产生相对高的污染水平。

youdao

The World Bank should support poor countries that need coal-powered energy in spite of its contribution to climate change, its president has said.

BBC: Jim Yong Kim

They were still a new denomination then, but had spread rapidly in the last fifty years around a nation of exploited factory workers, coal miners, and rural and inner-city poor.

NPR: Excerpt: 'The Prince of Frogtown'

Duke operates in the resource-poor Carolinas and built some of the world's biggest coal plants in the 1960s and 1970s, when people were more concerned about cheap, secure energy supplies than co2 levels.

FORBES: Magazine Article