WASHINGTON—The polar vortex hit its peak across much of America on February 19, with an icy grip that made Arctic Greenland seem like a toasty vacation spot in comparison. Even Mars has been warmer ...

Hail will finally get the attention it deserves this spring, with the world's largest field campaign ever devoted to studying ...

Over the past two decades, glaciers worldwide have lost 273 billion tonnes of ice to a warming world, driving sea levels to ...