The U.S. Navy has reached a Cold War-era milestone in the Arctic, deploying two Virginia-class submarines beneath the polar ice cap for the 100th time since World War II.

Researchers are sounding the alarm after a study of the largest ice cap in Europe painted a very grim picture of its future on our current trajectory. According to a study published in the scientific ...

As summer wanes in the Northern Hemisphere, scientists are sounding the alarm over what could be one of the most extreme Arctic melt seasons in recorded history — a shift with potentially far-reaching ...

Add Yahoo as a preferred source to see more of our stories on Google. The European Space Agency’s Mars Express orbiter captured this view of Mars’ south polar ice cap Feb. 25, 2015. Three years later, ...