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Zhao Yingmin, head of the Chinese delegation and vice minister of the Ecology and Environment, speaks at the closing plenary of the UN Climate Change Conference (COP25) in Madrid, Spain, Dec. 15, 2019. The UN Climate Change Conference (COP25) came to an end on Sunday after an unprecedentedly long extension, as negotiators failed to reach an agreement on Article 6 of 2015 Paris Agreement about the details of carbon market mechanisms. (Xinhua/Lu Yang)