An event focused on interactive public art led a group to Turtle Cove along the Allegheny River. Participants collected trash and constructed sculptures.
Alcoa’s Western Australia division is one of the world's largest alumina producing operations. Some say its decades-old agreement puts drinking water at risk.
The company will mine metallurgical coal, but an environmental group worries the project will exacerbate longstanding mine drainage problems in the Laurel Highlands.
Parts of the river have low dissolved oxygen levels caused by ammonia discharges from wastewater facilities. The announcement comes after environmentalists took legal action to speed up the process.