A Chinese young man who has shot videos of 70 glaciers over the past seven years in southwest China's Tibet Autonomous Region, was invited to demonstrate his works at the 25th United Nations Climate Change Conference held in Madrid, Spain on December 6, 2019. Wang Xiangjun is the first Chinese civilian to speak at the conference. And he demonstrated the bare sand and rocks after the melting of the glaciers there, to raise awareness on global warming.