EURACA is the official organizer for the Conference Series: Technologies and Materials for Renewable Energy, Environment and Sustainability (TMREES) has a main objective to promote sustainable, healthy and diverse ecosystems; encourage and support the national energy security systems through development of green-based and renewable resources and processes, bringing together participants from international research centers, universities, industry and administrative organizations around the world to exchange innovative and novel ideas, share field trial experiences in sustainability issues and to open a new window on the circumstances of the classical energy sources and their harmful impact on the society.