The Green Education Foundation (GEF) is a non-profit organization committed to sustainability education. It provides curriculum and resources to over 9,000 K-12 schools worldwide. GEF's programs include National Green Week, the Green Thumb Challenge, the Green Energy Challenge, and the Sustainable Water Challenge. These programs educate millions of students about environmental issues and empower them to implement solutions in their schools and communities. GEF also offers sustainability certifications and an online clearinghouse of lesson plans to support educators.