Project Learning Tree (PLT) was created in 1976, after passage of the first National Environmental Education Act in 1970 and celebration of the first Earth Day in 1970, raised the profile of environmental education in the United States.
Manhattan Project | One Tree Hill | One Tree Hill (TV series) | Project Runway | tree | Project Mercury | Christmas tree | Human Genome Project | The Blair Witch Project | Project Gemini | Herbert Beerbohm Tree | Project Greenlight | Porcupine Tree | Project Nike | Project Blue Book | Federal Art Project | The Joshua Tree | The Hanging Tree | Project Orion | Men's Recovery Project | Eden Project | Cathedral of Learning | World Justice Project | Social learning theory | Quebracho tree | Joshua Tree National Park | Wounded Warrior Project | Under the Yum Yum Tree | The Octopus Project | The Alan Parsons Project |