JUNGFRAUJOCH, March 21, 2019 (Xinhua) -- Swiss teenagers Sarangan Sivarajalingam (R) and Selma Schellenberg show copies of a postcard calling for action against climate change on the Aletsch glacier under Jungfraujoch in Switzerland, on March 20, 2019. Some 900 postcards from youths all over the world were stamped and sent on Wednesday from Europes highest postbox on the Jungfraujoch peak, Switzerland, to global leaders, calling for action against climate change.

ABHA (SAUDI ARABIA), March 21, 2019 (Xinhua) -- The photo taken on March 20, 2019 shows the Rijal Almaa village, west of Abha city, Asir Province, Saudi Arabia. Rijal Almaa is an ancient village which contains around 60 multiple-story buildings built of stone, clay and wood.

JUNGFRAUJOCH, March 21, 2019 (Xinhua) -- Postcards calling for action against climate change are stamped in Europes highest postbox on the Jungfraujoch peak in Switzerland, on March 20, 2019. Some 900 postcards from youths all over the world were stamped and sent on Wednesday from Europes highest postbox on the Jungfraujoch peak, Switzerland, to global leaders, calling for action against climate change.