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

A gigantic postcard breaking the Guinness Worlds Records is staged on the Aletsch glacier near Jungfraujoch in Switzerland, Nov. 16, 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)