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Zac Unger moved to Churchill, Manitoba, to cover the decline of the polar bear. It was 2008, and the adorable predators had become symbols in the battle over climate change. But the story he ended up writing in his new book was more complicated than he expected.

The owner of a 12-foot alligator recently seized by conservation officers is fighting for its return, saying the reptile he has shared a home with is a gentle giant that's no danger to anyone.

The second volume in Pulitzer-winning historian Rick Atkinson's planned trilogy on the American Revolution publishes Tuesday. Plus a graphic memoir, short fiction, and "the secret life" of a cemetery.

New research says climate change has caused toxic metal pollution to double in some Colorado rivers and mountain streams. It's complicating efforts to clean up abandoned mining sites.

Climate change and habitat loss are driving bears into urban areas in search of food. In Boulder, Colo., people are making an effort to harvest residential fruit trees to deter visits from bears.

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.

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.

Could the same economic forces that helped propel lab-grown diamonds and lab-grown meat forward help a startup end illegal rhino poaching? The answer is elusive.

A Shell Oil drilling rig has been pulled of the rocks, where it washed up a week ago during a storm. It has been towed to a bay where divers will inspect it for damage. The incident raises questions about the oil company's controversial plans to continue exploring for oil in the Arctic Ocean this summer.

Technology enabling virtual fences for pets is now being adapted for livestock. Ranchers near Yellowstone National Park are testing its ability to keep cows safe from grizzly bear attacks.