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Children line up for marching, the week before beginning middle school in the county town of Zhiduo. Hundreds of nomadic families are paid and provided with a new home to bring their children for education. The resettlement policy is seeking to modernize a society but looks set to break its nomadic heart bringing inner city problems to a rural world.Sanjiangyuan - The three rivers headwaters. The Tibetan plateau is the world's third pole, producing fresh water for billions downstream. In China, the future of the nation depends on how this water tower is conserved.  Where the Yangtze, Yellow and Mekong rivers begin, Tibetan nomads are moving to protect the land, its wildlife and in the process their ancient culture from melting away in the face of resettlement and urbanisation..