For a half-century fires have burned under Centralia, PA.

On the final two holdouts in Treece, Kansas, a former mining town that is soon to be wiped off the maps.

On geoengineering, a high risk/high reward fix for global warming.

Enbridge, Inc. spilled more than a million gallons of tar sands crude into the Kalamazoo River. Was John Bolenbaugh fired for refusing to cover this up?

On spending six months on the southern coast of Argentina with the “Jane Goodall of penguins” and several hundred of her research subjects.

A profile of environmental activist Van Jones.

On the Texas-sized trash island floating in the Pacific.

An investigation into Erin Brockovich and the lawsuits that made her famous.

The changing landscape of the Lower Ninth Ward in post-Katrina New Orleans:

There have been sightings of armadillos, coyotes, owls, hawks, falcons and even a four-foot alligator, drinking from a leaky fire hydrant. Rats have been less of a problem lately because of the stray cats and the birds of prey. But it’s not just animals that emerge from the weeds.

How an industry that couldn’t miss did just that.

How black market mining is destroying the Peruvian rain forest and enslaving child workers.

A report from the oil boom in North Dakota, where unemployment is 3.4 percent and McDonald’s gives out $300 signing bonuses.