Labourers ride on a train at a salt producing factory at Chaka Lake in west China's Qinghai province
Labourers ride on a train 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)