Paris climate deal: U.S. and China formally join pact
G20峰會:中美聯合批准巴黎氣候變化協定
British Broadcasting Corporation, September 3, 2016
http://www.bbc.com/news/world-asia-china-37265541
China's hosting of G20 proves controversial ahead of opening
Deutsche Welle, September 3, 2016
http://www.dw.com/en/chinas-hosting-of-g20-proves-controversial-ahead-of-opening/a-19525013