When Trump floated the idea of the U.S. acquiring Greenland, some called it a random brain fart. But there is a real conversation among security experts about control of the Arctic in the 21st century. As climate change opens up new avenues for shipping, spying, mining, submarining and warfare, the far North Atlantic matters more and more.

Sherri Goodman was the Pentagon's chief environmental officer in the Clinton Administration. Her specific expertise is in the polar regions, Russian nuclear subs, climate chaos, and Arctic security. She's a Senior Fellow with the Polar Institute and the Environmental Change and Security Program with the Woodrow Wilson International Center, and her latest book is "Threat Multiplier: Climate, Military Leadership and the Fight for Global Security".

Josh picks her brain about the threats and opportunities of climate change… and why Greenland does, in fact, matter.

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