Volunteers take selfies at the media center of the 15th meeting of the Conference of the Parties to the UN Convention on Biological Diversity (COP15) in Kunming, southwest China's Yunnan Province, Oct. 9, 2021. The media center of the COP15 opened on Saturday. The COP15 is set to kick off in Kunming on Oct. 11. (Xinhua/Chen Xinbo)