See more of Gordon Buchanan's mobile bear hide 'Ice Cube'.
Take a look at some spectacular images from Gordon Buchanan's Polar Bear Family & Me.
The Operation Iceberg team follow the epic journey of an iceberg out at sea.
Knut was an incredible polar bear, raising awareness worldwide.
Polar pictures from the programme Vanishing Antarctic.
The Frozen Planet can be surprisingly full of life.
Frozen Planet heads to the ends of the earth to capture incredible wildlife.
The Frozen Planet showcases some of the world's harshest environments.
Hurtigruten ferries sail the Norwegian coast, travelling through breathtaking scenery.
Read about the Arctic explorers who risked everything to reach the top of the world.
What impact will global warming, holes in the ozone and atmospheric haze have?
Polar bears are the largest land carnivores on Earth.
Find out more about the most inhospitable places on the planet; the Arctic and Antarctic.
Arctic explorer Jim McNeill chats to Eden about his expeditions to the North Pole.
The Arctic Weddell seals were named after British sailor, Captain James Weddell.
Follow top travel writer Tom Hall's advice on how to get to the Antarctic.