This international conference stems from the project ERASMUS+ TEDS – Teacher Education for Sustainability. Its goal is to contribute to developing initial and life-long learning in sustainability training (ESD) for teachers and teacher educators. It will use research and innovative practices to examine the best conditions for developing ESD professional development training in educational settings from the early years onwards. The conference is also an opportunity to present and discuss the results obtained from a three-year project1 that brought together researchers, teaching teams, and educators involved in ESD. The project was led by the following five European universities: University of Aveiro, Project Leader (Portugal), University of Malta (Malta), Vytautas Magnus University/Vytauto Didziojo Universitetas (Lithuania), University of Nantes (France) and University of Helsinki/Helsingin Yliopisto (Finland). The project’s ambition is to inform European training policies through proposals for practices, tools for training educators, and the production of scientific knowledge.