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Sonam Wangchuk is an engineer from Ladakh, a cold desert region in the Himalayas. He builds artificial glaciers - or 'ice stupas' - that collect water during the winter and melt during the spring. It's an invention that's helping thousands of local farmers and has led to the planting of more than 5,000 trees. Presenter: Emily Webb Producer: Alice Gioia Picture: An ‘ice stupa’ or artificial glacier Credit: Courtesy of Sonam Wangchuk