This landmark David Attenborough series presents the most comprehensive portrait of the natural world ever seen on television. To produce it, camera teams journeyed for three years from high Himalayan valleys to the depths of the ocean; from the sands of the Sahara to the humid jungles of Borneo. Everywhere they travelled they chronicled the many different ways that animals and plants have evolved in order to defend themselves against the elements - and often - one another.Episode 1: The Building of the Earth Episode 2: The Frozen WorldEpisode 3: The Northern ForestsEpisode 4: JungleEpisode 5: Seas of GrassEpisode 6: The Baking DesertsEpisode 7: The Sky AboveEpisode 8: Sweet Fresh WaterEpisode 9: The Margins of the LandEpisode 10: Worlds ApartEpisode 11: The Open OceanEpisode 12: New Worlds