President Donald Trump is pushing for a Greenland land grab. But warming temperatures could disrupt development in the region ...

Trump is flexing imperialist muscles, but his plan for a hasty peace deal between Russia and Ukraine is incoherent.

The tiny island of Yonaguni on Japan’s western frontier is too small for even a convenience store. But its wooded mountain ...

The Army's research facility includes a permafrost tunnel — about a third of a mile long — that has Ice Age-era animal bones ...