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Presenter Bruce Parry turns his attention to the Arctic Circle. Indigenous ways of life that have remained virtually unchanged for millennia will cease within our lifetimes. Marine mammal hunters, like the Inuit of Northern Greenland, will have to find new ways to live in this harsh place. They are the last of their kind. But for others, this rapidly changing world promises great opportunity. The Arctic is rich in oil, gas and minerals. The US geological survey estimates that 25% of the world's undiscovered oil and gas could be located under the polar ice cap.