The 4th International Conference on Environmental Management, Engineering, Planning and Economics (CEMEPE) includes the current and new issues in environmental science, engineering and management and it is taking place, similar to the previous ones, together with the special conference of the International Society for Ecotoxicology and Environmental Safety (SECOTOX), providing a special forum to environmental ecotoxicology. The 4th CEMEPE Conference deals with environmental engineering and management, incorporating themes related to planning and economics aiming at creating a potential for osmosis between environmentalists and other scientists such as economists, engineers, planners, policy makers etc. The conference is designed to encourage the exchange of ideas and knowledge between diverse groups of the scientific community concerned by current issues in environmental science, engineering, management, planning and economics. The 1st and 3rd CEMEPE conferences were successfully completed in Skiathos island in June 2007 and 2011, the 2nd was held in the picturesque Hellenic island of Mykonos, in June 2009, whereas the 4th was held in Mykonos island, between June 24 and 28, 2013. Mykonos, was chosen to host the 4th CEMEPE/SECOTOX, because it boasts some of the most beautiful beaches in the whole of Greece, it has rich cultural heritage and it affords a wealth of tourist facilities...