Tourists ride camels near China's largest desert lake Hongjiannao in Yulin, north China's Shaanxi Province, Sept. 24, 2011. Hongjiannao is shrinking as a result of climate change and human activities, and may vanish in a few decades. Its lake area, which measured more than 6,700 hectares in 1996, has shrunk to 4,180 hectares. Its water level is declining by 20-30 centimeters annually and its water PH value has risen to 9.0-9.42 from 7.4-7.8.

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