Chinese President Xi Jinping has a videoconference with United Nations (UN) Secretary-General Antonio Guterres in Beijing, capital of China, Sept. 23, 2020. (File photo: Xinhua)

BEIJING, Oct. 14 (Xinhua) -- Chinese President Xi Jinping started delivering a keynote speech via video link at the opening ceremony of the Second United Nations Global Sustainable Transport Conference, which was held Thursday.