Coal ash swirls on the surface of the Dan River following one of the worst coal-ash spills in U.S. history into the river in Danville, Va., in February 2014. The Environmental Protection Agency wants to ease restrictions on coal ash and wastewater from coal plants.
An e-bike resembles a regular bicycle, with its batteries and electric motor integrated into the bike's frame. Enthusiasts see e-bikes on national park trails as a great thing, but some traditional riders and environmentalists see big problems ahead.
Environmental Protection Agency administrator Andrew Wheeler speaks during a television interview in front of the West Wing of the White House, on Sept. 19, 2019. Wheeler has threatened to withdraw billions of dollars in federal highway money unless California clears a backlog of air pollution control plans.
The wake of a supply vessel heading toward a working platform crosses over an oil sheen drifting from the site of the former Taylor Energy oil rig in the Gulf of Mexico in 2015. The Coast Guard says it has contained the oil spill.
A man crosses a bridge over the Poudre River, in Fort Collins, Colo. The picturesque river is the latest prize in the West's water wars, where wilderness advocates usually line up against urban and industrial development.
The village of Hoosick Falls, N.Y., sits along the Hoosick River in eastern New York. Elevated levels of a suspected carcinogen known as PFOA were found in the village's well water, which is now filtered.
Hansi Lo Wang/NPR