2026 4th International Conference on Chemical, Energy Science and Environmental Engineering (CESEE 2026) will be hosted in Vienna, Austria during May 27-30, 2026! CESEE 2026 is an international venue for the presentation of original research findings, as well as the exchange and dissemination of creative, practical experiences in various engineering domains. The conference will include the participation of renowned keynote speakers, oral\\posters presentations and technical sessions to broaden its scope in the areas of chemical, energy and environmental. It aims to create a cross-disciplinary and international summit that will bridge the gap between departmental, institutional, public and private research organizations, and global barriers, allowing for the integration of research, application and education in the emerging field of chemical, energy and environmental.