This book presents the abstracts of the selected contributions to the 2026 13th International Conference on Energy, Environment and Earth Sciences (ICEEES2026) and 2026 12th International Conference on Civil and Environmental Engineering (ICCEE2026), held together in Suzhou, China during May 23-25, 2026.

ICEEES2026 and ICCEE2026 were multidisciplinary conferences organized with the objective of bringing together specialists, research scholars, and students to exchange ideas, communicate, discuss research findings.

All abstracts in the abstract book are published under the Creative Commons Attribution 4.0 International (CC BY 4.0) License. This license allows readers to copy and redistribute the material in any medium or format, and to remix, transform, or build upon the material, including for commercial use, providing the original author is credited. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Copyright on any open access abstract published by Science Publishing Group is retained by the author(s). Authors grant Science Publishing Group a license to publish the abstract and identify itself as the original publisher. Authors also grant any third party the right to use the abstract freely as long as its original authors, citation details and publisher are identified.