The document summarizes the work of the Greater Portland Sustainability Education Network (GPSEN) which is recognized as a Regional Centre of Expertise (RCE). It discusses GPSEN's vision, priority action areas including advancing policy, transforming learning environments, building educator capacity, empowering youth, and accelerating local solutions. It provides examples of projects within these areas like sustainability trainings, youth networks, and community partnerships. It encourages increasing collective impact through collaboration, aligning with initiatives, sharing work, and engaging communities to advance sustainability.