In one coal power plant in Poland, flue gas is converted into sulfur and nitrogen byproducts that can be used as fertilizer.
在波兰的一家燃煤电厂，烟气被转化为硫和氮，这些副产品可以用作肥料。
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Researchers in California, Oregon and Washington noticed specks of sulfur compounds, carbon and other byproducts of coal combustion coating the silvery surfaces of their mountaintop detectors.
With the aim of saving energy, the washery has also developed quality briquettes made of byproducts such as coal slime, and the said briquettes have an annual output of more than 10,000 tons.