Foreboding environmental milestones abounded again this year in the Arctic, where experts say dramatic climate shifts are fundamentally altering the ecosystem and how it operates. One recent turning ...

A polar bear (Ursus maritimus) swimming beside a melting iceberg in Naujaat, Nunavut. The Arctic is a dramatically different place than it was 20 years ago, when scientists first began giving it an ...

Arctic tundra, which has stored carbon for thousands of years, has now become a source of planet-warming pollution. As wildfires increase and hotter temperatures melt long-frozen ground, the region is ...

The Arctic is one of the most punishing environments on Earth, where survival depends on extreme specialization. Animals ...

Climate change is warming the Arctic tundra about four times faster than the rest of the planet. Now, a study suggests that rising temperatures will spur underground microbes there to produce more ...

Accelerated Arctic warming is reshaping the polar environment, but focusing only on the impacts of long-term annual temperature rise can miss key consequences of shorter-lived, but extreme, weather ...