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When the European Space Agency wanted ground data to better understand the ice measurements it would be taking from its new CryoSat 2 satellite, it enlisted the help of the Belgian explorers Alain Hubert and Dixie Dansercoer. Their mission: walk 2000 kilometres across the ice from Siberia to Greenland via the North Pole, measuring snow cover along the way and ensuring they finish before the spring melt. The Belgians, who had previously crossed Antarctica together, delivered as asked, and were among the first to provide results for the ongoing . Alun Anderson talked to Dansercoer…