Extreme cold warnings were issued for an 11-state swath of the U.S. stretching from the Canadian border to Oklahoma and ...

More than 95 million people are facing gripping cold Tuesday as a polar vortex sends temperatures plunging to record levels, closing schools, bursting pipes and forcing communities to set up more ...

The Arctic Ocean is a vast and pristine expanse that has long been a defining feature of the planet, but now it stands on the ...