CELF Summer Institutes are accredited and immersive professional learning programs for K-12 teachers focused on place- and project-based instruction using the Big Ideas of Sustainability to engage students in real-world problem solving. The Institutes give teachers an opportunity to reflect and connect with peers before the academic year begins. CELF supports teachers as they help prepare the next generation with systems of thinking and problem solving skills so students feel empowered to solve bigger problems for their futures together.