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Delegates of the Third United Nations Environment Assembly pose for a photograph at the exhibition booth of Sina Weibo in Nairobi, Kenya, on Sunday. The poster they held was for a micro blog calling for protection of pandas. Several Chinese companies such as Mobike, Sina Weibo and Alibaba Group's Ant Financial attended the conference.Chen Cheng / Xinhua

Describing BRI as "a new vision" that China has brought to global development, Guterres said discussions like the BRI are "extremely useful" at a time when there is doubt about globalization and free trade.

Despite being a fulltime mother, Chen still found time to take classes at the Central Academy of Fine Arts in Beijing for two years, paint a book cover, and translate a book about the history of contemporary Western art from English to Chinese, together with two friends.

Demand for oil in China and the US is expected to continue to grow next year, Vice President of Refining and Chemicals at research firm Wood Mackenzie Alan Gelder said, "and globally, we see 3.5 percent growth for petrochemical products in 2018."

Delegates from more than 25 countries attended this year's conference, said Barreto, including academics from 26 universities, and representatives from the Organization for Economic Cooperation and Development (OECD), United Nations Conference on Trade and Development (UNCTAD) and the World Intellectual Property Organization (WIPO).