Amazing secrets of the ocean | Man and the secrets of the sea | Documentary

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When it comes to regulating global temperatures, forget the Amazon Rainforest. It’s the oceans that really deserve the title of lungs of the planet. Their plankton provides us with oxygen. Their currents transport heat from the tropical regions to the poles, acting as an air conditioner. They absorb almost a quarter of the carbon dioxide emitted annually. But so much of what they do and exactly how they do it is still unknown. To gain a deeper understanding of the importance of oceans in regulating our climate, we bring you four stories from four different corners of the world. From the seaborne lives of the Bajaus of Asia to the scientific crew of the ‘Tara’ in Greenland.