Project Learning Tree is an award-winning environmental education program designed for teachers and other educators, parents, and community leaders working with youth from preschool through grade 12.

PLT teaches students how to think, not what to think about complex environmental issues. Recognized as a leader in environmental education for 40 years, PLT enhances critical thinking, problem solving, and effective decision-making skills. PLT's professional development is carefully designed to create effective learning experiences. PLT's award-winning, multi-disciplinary curriculum materials are hands-on and fun, and aligned with state and national education standards. More than half of all PLT activities can be conducted outdoors. 

Studies show that when environmental education and outdoor learning components are integrated into the curriculum, student achievement increases, including test scores - particularly in science and math. Independent evaluators confirm PLT increases students' knowledge, reasoning, and academic skills.

PLT inspires educators and youth to improve the environment at their school, at home, and in their community.  The goal is for students to "learn by doing."

PLT's GreenSchools program provides training and resources for teachers and students to reduce their school's environmental impact, improve health, and save money. A set of investigations enable students to collect and analyze data and design a student-driven project in which they apply their STEM skills to make a difference in their world. 

PLT's GreenWorks! grants fund these and other environmental service-learning projects such as creating gardens, restoring habitats, reducing energy use, conserving water, recycling, and making better use of school grounds.