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Ma Kai, Chinese Vice Premier and the special envoy of President Xi Jinping, speaks during the One Planet Summit in Paris, France, on Dec. 12, 2017. (Xinhua/Chen Yichen)

Ma Kai, Chinese Vice Premier and the special envoy of President Xi Jinping, speaks during the One Planet Summit in Paris, France, on Dec. 12, 2017. (Xinhua/Chen Yichen)