The 4th International Conference on Environmental Science and Applications (ICESA'23) aims to become the leading conference in fields related to Environmental Science and Applications. The goal of this environmental engineering conference 2023 is to provide a space for scholars from all over the world to present advances in the relevant fields and to foster an environment conducive to exchanging ideas and information. Topics themes for ICESA’22 include, but are not limited, to the following: Air pollution and treatment Biofuels Desalination Energy Management Environmental Protection Environmental Risk Assessments Environmental Sustainability and Development Greenhouse Effect, Global Warming, and Climate Change Infectious Diseases and the Environment Nanotechnology Impacts on Environment Oil Spills Pollution and Health Issues Renewable and Non-Renewable Energies Soil Pollution and Treatment Wastewater Management and Treatment Water Pollution and Treatment