The School of Environmental Leadership (SEL) is a "school within a school" located within a comprehensive public high school. The SEL is a project-based, environmentally-focused program that emphasizes development in leadership and 21st century skills..

The four-year program is designed to give students increasing ownership and independence over their educational experience. The SEL does this by integrating academics, leadership, development, public speaking, creative arts, technology, engineering, project management, environmental justice, and community service. All of which focus on the "Four C's": Collaboration, Communication, Critical Thinking, and Creativity.

The SEL's flagship school opened in 2011 and is located in Marin County, CA, commonly referred to as MarinSEL. MarinSEL is located within Terra Linda High School in the San Rafael City Schools district in San Rafael, CA.