Erling Kagge, author of Philosophy for Polar Explorers, was the first man in history to reach all of the Earth's poles by foot – the North, the South, and the summit of Everest. In this interview with the BBC’s Razia Iqbal, he brings together the wisdom and expertise he has gained from the expeditions that have taken him to the limits of the earth and to the limits of human endurance. 

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