For nearly a decade, author Robert Macfarlane has been venturing into ice caves, exploring underwater rivers and crawling through catacombs. His latest book, "Underland: A Deep Time Journey," documents these travels and explores the human relationship with the "deep time" of down below.
While it's been unusually cold and snowy in much of Europe, the Arctic has been seeing record warm temperatures and a huge loss of ice. Here's how the two are linked, and what they might have to do with climate change.
The Beaufort Gyre, a key Arctic Ocean current that traps huge amounts of ice and cold freshwater, is behaving strangely. When it eventually discharges its contents, the event could begin a period of sharply lower temperatures in northern Europe.
40 years ago, a U.S. military plane carrying nuclear weapons crashed in Greenland. A BBC investigation has found that one of the nukes was unaccounted for after the crash. The BBC's Security Correspondent Gordon Corera has details.
Greenland is an autonomous territory of Denmark. But today Greenlanders voted on whether to increase self-rule on the world's biggest island. Host Ken Bader speaks with journalist Karsten Sommer in Greenland's capital Nuuk.
The answer to our Geo Quiz is northern Greenland, where linguistic anthropologist Stephen Pax Leonard is going to live with a local community under threat from global warming and document their traditions and language. Anchor Jeb Sharp speaks with them.
We're looking for a bay that lies between Greenland and Canada. Scientists there have been monitoring ocean temperatures: they're looking into how quickly the region's climate is changing and they're enlisting what they call 'biological oceanographers'
NASA monitors Greenland's Jakobshavn glacier via satellite and is interested in the enhanced mass loss. NASA Program Manager Seelye Martin explains how a team of scientists is investigating how water that pools on the glacier's surface reaches the ocean.