Postcards calling for action against climate change are stamped in Europe's 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 Europe's highest postbox on the Jungfraujoch peak, Switzerland, to global leaders, calling for action against climate change. (Xinhua/Xu Jinquan)
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