Photo taken on May 25, 2013 shows the No. 12 glacier in Laohugou Valley on the western section of the Qilian Mountain, northwest China's Gansu Province. The No. 12 glacier in Laohugou Valley, the longest glacier in the Qilian Mountain, has presented an apparent shrinkage due to the rising temperature, according to a research made by China Academy of Sciences. (Xinhua/Nie Jianjiang)