7/7 David Attenborough investigates the effects of rising temperatures in the polar regions.
6/7 What draws humans to the coldest and most hostile reaches of our planet?
5/7 The story of the few extreme survivors who remain in the polar regions during winter.
4/7 Autumn brings epic journeys for polar wildlife as most hurry to escape the refreeze.
3/7 Polar animals race to rear their young during times of plenty under the midnight sun.
2/7 Spring arrives in the polar regions, and the sun appears after an absence of five months.
1/7 Looking at the Arctic and Antarctic, the greatest and least-known wildernesses of all.