A road sign is seen in front of the Kharola glacier some 200km (125 miles), west of Lhasa Tibet Autonomous Region November 25, 2009. Nearly 2 billion people in Asia, from coastal city dwellers to yak-herding nomads, will begin suffering water shortages in coming decades as global warming shrinks glaciers on the Tibetan Plateau, experts said. REUTERS/Nir Elias (CHINA RELIGION ENVIRONMENT SOCIETY)