In 1847, Sir John Franklin and a crew of 128 men disappeared without a trace while searching for the Northwest Passage, a sea route connecting the Atlantic and Pacific oceans. 175 years later, a team ...

A conveyor belt of ocean water that loops the planet and regulates global temperatures could be heading for a tipping point.

For most of human history the very top of the globe has remained out of play, too cold, too distant, and too dangerous for the kinds of intense exploitation that have reshaped other regions. But the ...