A labourer works at a salt producing factory at Chaka Lake in west China's Qinghai province
A labourer works at a salt producing factory at Chaka Lake in west China's Qinghai province May 5, 2007. Chaka Lake, holy to ethnic Tibetans, is shrinking, hit by decreased rainfall and desertification partly caused by overgrazing. REUTERS/Simon Zo (CHINA)