Scientists from Northwest Institute of Eco-Environment and Resources, China Academy of Sciences, measure the albedo of the Urumqi River source Glacier No1 in Tianshan Mountains, Northwest China's Xinjiang Uygur autonomous region, April 29, 2017. From April 27 to 30, CAS scientists carried out a "body check" for the Urumqi River source Glacier No1 in Tianshan Mountains, including its thickness, temperature, albedo, material balance, velocity of speed, so as to analyze its changing trend over the past half century. [Photo/Xinhua]