Hundreds of swimmers in Chicago joined the first open-water event on the Chicago River in a century, celebrating the city's progress in restoring a waterway once considered a toxic wasteland.

Tangier Island in Virginia — one of the last inhabited islands in the Chesapeake Bay — is under threat from rising sea levels and climate change.

With higher utility bills, a house that produces more energy than it uses may be appealing. In Southern California, one such house has existed for more than a decade: the "Green Idea House" in Hermosa Beach.

The U.S. Forest Service is trying to fast track the rescission of the 2001 Roadless Rule, which banned logging and new roadbuilding in 58 million acres of national forests. But it won't be easy.

Republican Sen. Ted Cruz has said China is funding climate lawsuits against American oil and gas companies to weaken the U.S. He hasn't provided evidence to support the claim.

The explosive growth of cloud-computing data centers is straining electric grids, driving emissions and guzzling water.

A movie star to his core, Robert Redford has died after a visionary career in cinema, including founding the Sundance Institute that transformed the market for independent films.

It's not always for the better.

Words related to the natural world, such as 'river,' 'moss,' and 'blossom,' have dramatically declined in English-language books over the last 200 years.

Bur oak trees were once known as the 'King of the Great Plains.'