As one blast of Arctic air pushes out to sea, already a new surge of cold air, driven by a breakdown of the polar vortex, is ...

Bitingly cold Arctic air keeps pummeling the U.S. with ruthless cold snaps—despite warming winters nationwide. A study explains why: the solution lies far above your head, in the upper atmosphere ...

A powerful photo series showing polar bears wandering through abandoned buildings on a remote Russian island has captured the world's attention — but experts say it's not just an eerie snapshot. It's ...