It is one of the most extreme places on Earth: dark and frozen for months in the winter, without trees or edible plants in the summer. Yet 4 million people have learned to live there thanks to their understanding of the wild nature that surrounds them. It is the Arctic, with its animals such as belugas, narwhals and seals, essential for the survival of men. An extraordinary documentary from the BBC Human Planet series shows its most "secret" and unknown corners. China, a leader in the field of renewable energy? Not much is known about it, but in reality it is on its way to becoming the largest producer of wind and photovoltaic systems, making the USA and the European Union nervous. At the National Museum in Copenhagen, incredibly preserved deceased and funerary objects open up glimpses into the Bronze Age.