NAIROBI, Nov.... 9( Xinhua)--The 2023 China-Africa Sustainable Investment Summit began in Nairobi, the Kenyan capital, Thursday, with delegates renewing the call for enhanced collaboration aimed at securing a just and green transition.Co-hosted by the international conservation lobby, World Wildlife Fund( WWF), the Alliance of Chinese Business in Africa for Social Responsibilities( ACBASR) and the Financial Center for South-South Cooperation, the summit was attended by senior policymakers, dipl