This fantastic six part series from the BBC’s renowned Natural History Unit combines the epic scale of Planet Earth with the emotional intimacy of a wildlife diary. Each episode is set in a different part of the world and examines the effects of global climatic phenomena such as the annual flooding of Botswana's Okavango Delta and the brief Arctic summer.

Using state of the art HD technology, these amazing programmes capture the Earth’s most dramatic and epic wildlife spectacles and the intimate stories of the animals caught up in them.

From the flooding of the Okavango Delta, in Africa, to the great summer melt of ice in the Arctic and the massive annual bloom of plankton in the northern Pacific Ocean, each of the six programmes features a different event set in one of the world's most iconic wildernesses. The characters include tiny grizzly bear cubs emerging from their den in snow-covered mountains; baby elephants struggling to survive against drought and lion attack in Africa; humpback whales hunting as a team; the world's largest concentration of dolphins and sharks gathering off the coast of South Africa; and polar bear families navigating their precarious way on ever-thinning ice.

The world-renowned BBC Natural History Unit uses sophisticated high definition cameras, cutting-edge aerial, underwater and ultra slow-motion filming techniques to capture in intimate detail some of the audience's best-loved wildlife, as their lives become entwined with these dramatic events. As the Earth is rapidly changing, we can no longer take these great natural events for granted. By filming the events and their fluctuations this series takes the pulse of the planet.