Photo taken on Oct. 11, 2021 shows commemorative stamps and a first day cover for the 15th meeting of the Conference of the Parties to the UN Convention on Biological Diversity (COP15) at a postal outlet in Kunming, southwest China's Yunnan Province. China Post issued a commemorative stamp Monday for the COP15 that opened in Kunming. A total of 7 million of these stamps, with a denomination of 1.2 yuan (about 19 U.S. cents), can be purchased at designated postal outlets and online shops in the next six months. The stamp is in the shape of a water drop and was designed to highlight the concept that water is the source of life and all things. [Photo by Wang Guansen/Xinhua]

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