Lithium and other elements that the U.S. needs for vital defense, energy and other applications could become harder to obtain ...

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 ...

Yet this evolution of the icescapes and wild tundra above the Arctic Circle – outside of out-of-bounds Russia, which ...