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In this fourth episode, the team explore China's vast North-West region which borders several countries including Russia, Kazakhstan and Mongolia. It's the home to the centuries-old Silk Road trade route, ancient cities, and acres of arid desert - covering over a sixth of China's total land mass. Finn Aberdein finds out how technology is transforming life here with a visit to the world's largest solar farm and he meets the people who are striving to stop the desert in its tracks. Cameron Andersen is in Shaanxi province to taste a Chinese business story as he discovers how apple farming has become a global business. And Jing Lusi is on the hunt for one of the rarest animals on earth - the notoriously shy Wild Camel - uncovering the efforts being made to save the species from extinction.