PHNX Materials has devised a way to strip fly ash of sulfur and aluminum, impurities that concrete companies would rather ...

Because cement emits large amounts of CO₂ — both from the high-temperature kilns used in its production and from the chemical ...

Beckjord coal plant site, where leftover coal ash is stored in unlined pits perched on the Ohio River. They worry that rising groundwater will directly mix with the toxic ash buried on site.