Welcome to the official website of 2025 9th International Conference on Environmental Engineering and Sustainable Development (CEESD 2025). CEESD 2025 is co-organized by International Society for Environmental Information Sciences (ISEIS), Asia Pacific Institute of Science and Engineering (APISE), and technically sponsored by Sophia University, and will be held in Sanya, China from December 05 to 07, 2025. The annual 2025 9th International Conference on Environmental Engineering and Sustainable Development (CEESD 2025) addresses research issues in Environmental Engineering, Sustainable Development and applications. It is a leading forum for researchers, practitioners, developers, and users to explore cutting-edge ideas and to exchange techniques, tools, and experiences. We invite the submission of original research contributions. CFP Flyer Downloading