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The U.S. National Center for Sustainable Development (NCSD) CEO Mitchell Stanley (L) and Gong Jialong, CEO of Guangdong-Hong Kong-Macao Greater Bay Area International Energy Exchange Co. Ltd., receive an interview with Xinhua in Houston, Texas, the United States on May 16, 2019. Two Chinese companies signed Memorandums of Understanding (MoUs) with the U.S. National Center for Sustainable Development (NCSD) Thursday to facilitate energy business. (Xinhua/Liu Liwei)