"#MountainsMatter" theme chosen to celebrate this year's Int'l Mountain Day

Cows are seen walking down the mountains through a bridge during the Desalpe festival in Charmey, Switzerland, Sept. 29, 2018. Dec. 11 is the International Mountain Day, which was established by the UN General Assembly in 2003 to encourage sustainable development in mountains. "#MountainsMatter" is the theme chosen for this year's celebration of International Mountain Day. (Xinhua/Xu Jinquan)