Gallery: The Sad, Unnatural Habitats of Polar Bears in Captivity

Seven of 16 planetary vital signs are in their most extreme state ever recorded, and El Niño is here to make matters even worse.

While oil is known to float, new research finds that over time it can permeate even extremely deep marine habitats, with animal populations declining by as much as 80 percent.

Ancient plants reveal that the vestiges of the North American ice sheet started expanding a few thousand years ago, but that climate change caused it to reverse course.

As coastlines change, so do surf breaks. That may spell the end for premier waves and the tourist economies that depend on them.

Redwoods adapted to a cool, foggy climate. Now a new study shows they slow down photosynthesis when their environment warms.

The death of a lab worker in Russia has authorities looking at whether plague played a role. Even if it did, though, the odds of it spreading are very low.

Here’s what we know about the record-setting El Niño on a record-hot planet, and the most important questions scientists are trying to answer.

Scientists can’t agree why reefs in the Red Sea have long been immune to bleaching. The answer could be the key to saving these tough corals as climate change begins taking its toll.

The new image isn’t just stunning—it may also provide clues about how this star survived its own explosion.

Scientists left structures up to 100 meters under the surface. Here’s what they found when they retrieved them 10 years later.

Lying beyond Pluto, 2026 ED138 could be as large as 1,500 kilometers in diameter. Astronomers are still working to confirm whether it meets the criteria for a dwarf planet.

This week, the Pentagon released a full-resolution image of the vehicle, the capabilities of which remain rather mysterious.