The aim objective of the International Conference on Environmental Science and Technology (ICEST) is to provide a platform for researchers, engineers, academicians as well as industrial professionals from all over the world to present their research results and development activities in Bioinformatics and Biomedical Technology.The 2013 4th International Conference on Environmental Science and Technology (ICEST 2013) will be held in Macau during March 17-18, 2013.