ARCTIC CIRCLE (March 10, 2016) USS Hartford (SSN 768) surfaces in the Arctic Circle near Ice Camp Sargo during Ice Exercise (ICEX) 2016. Servicemembers and civilians assigned to Arctic Submarine Lab clear ice from the hatches to allow for surface access. ICEX is a five-week exercise designed to rese...

In the near future, the North Pole could truly be relegated to the realm of history. Since scientists started measuring winter sea ice, we’ve lost half a million square miles of it—and for every additional ton of carbon dioxide in the air, about 32 square feet of summer sea ice disappears. Robin