At the UNU-UNESCO International Conference on Globalisation and Education for Sustainable Development in 2005 which celebrated the Asia-Pacific launch of the United Nations Decade of Education for Sustainable Development (DESD), the United Nations University (UNU) launched the first group of seven RCEs. In five years of development, the RCE community has come a long way. Challenges and struggles bore fruit of discoveries and innovations. This publication shares lessons from RCEs and their partners at the regional and international levels. As of April 2010, there were 75 RCEs worldwide.