Gordon Buchanan, Kate Humble and Simon Reeve continue their adventure, broadcasting live from the edge of Arctic. Their base is the tiny Canadian town of Churchill, otherwise known as the polar bear capital of the world. While the bears gather to wait for the big freeze, the team discover why the Arctic is changing faster than anywhere else on Earth. In a place where life is driven by ice, what happens when it disappears? Tonight, Gordon meets the Polar Bear Cops tasked with keeping the town safe. Kate heads to Sweden to help round up some reindeer and Simon joins the intrepid Nasa scientists monitoring the melt of Greenland's glaciers. And all the live action from the bears out on the tundra.