An elephant-themed video clip is seen on screen during the opening ceremony 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. 11, 2021. (Photo: Xinhua)

 
Chinese President Xi Jinping started delivering a keynote speech Tuesday afternoon via video link at the leaders' summit of the 15th meeting of the Conference of the Parties to the Convention on Biological Diversity (COP15).