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Craig Foster spent a year diving — without oxygen or a wetsuit — into the frigid sea near Cape Town, South Africa. His documentary is now nominated for an Oscar. Originally broadcast Oct. 20, 2020.

A U.S. Supreme Court decision last year stripping wetlands of most federal protections is drawing more attention to the threatened ecosystems, and what states can do in response.

For tourists, Illinois is the place to be for the historic cicada emergence. The 17-year brood in the state’s northern half and the 13-year brood in the southern part are set to converge near Springfield.

Some Navajo are trying to bring back their traditional food culture, including drinking Navajo "tea." It's brewed with a plant called greenthread that thrives in the mid-summer heat of the Southwest.

Paula Bernstein and Elyse Schein were both adopted as infants. They met for the first time when they were 35 years old. That's when they discovered they are identical twins — separated at adoption and subjects in a secret research project.

The Trump administration says it is seeking a huge budget to refill and expand its munitions.

There was a circle in Maria Burns' yard where grass wouldn't grow and trees died. She knew what it was: An old natural gas well, plugged when she was a little girl, starting to leak again.

In Minnesota’s rapidly warming forests, researchers are planting trees from southern climates because they’re expected to grow better as temperatures rise.

Seattle, along with other cities, is struggling to balance the need for more housing with the preservation and growth of trees that help address the impacts of climate change.

When SpaceX opened its rocket factory and launch pad in South Texas, few locals thought it would morph into such a large operation. Now environmentalists are worried about the long-term effects.