A local Kham women in typical traditional headwear of semi-precious stone and colourful dress. Yak were vital to human civilization reaching the the remote and desolate Tibetan plateau. Dung used as fuel provided warmth while other yak products, such as hair, meat and milk provide shelter and sustenance.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..