This eight-part BBC documentary focuses on how humans and the environment interact. Having recently landed on American network the Discovery Channel, this documentary in the vein of Planet Earth examines something conspicuously absent from the typical nature documentary: humans. Since the time of cavemen, humans have been adapting to the world's varying climates, ecosystems and landscapes, learning to live everywhere from the temperate zones in Idaho to the Altai Mountains of Mongolia, from the jungles of Brazil to the waters of Borneo. Each episode explores a different human habitat with incredible footage. So don't get left out of the loop: The DVD has arrived stateside.