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Joyce Msuya, acting executive director of the United Nations Environmental Programme, reacts during an exclusive interview with Xinhua in Nairobi, capital of Kenya, March 5, 2019. (Xinhua/Zhang Yu)

Joyce Msuya, acting executive director of the United Nations Environmental Programme, reacts during an exclusive interview with Xinhua in Nairobi, capital of Kenya, March 5, 2019. (Xinhua/Zhang Yu)