Project Learning Tree
began in 1976. Educators and personnel from the American Forest Institute and the Western Regional Environmental Education Council came together to develop an unbiased, educationally sound program for elementary and secondary students and their teachers. The first workshops were held in 13 states.
In 1987, the first International PLT Coordinator's Conference was held. By the end of the 1980's, PLT was active in 49 states.
By 1994, PLT was in all 50 states.
In 2006, PLT celebrated it's 30th Anniversary. Now we have a grassroots network of 3,000 active volunteers and state coordinators who have trained more than 500,000 educators.
Currently PLT is in Canada, the U.S. Territories, Japan, Mexico, Sweden, Slovakia, China, Finland, Brazil, Jordan, and the Philippines. Materials have been translated and adapted for use in these countries.
has been active for many years. It now boasts diverse support and sponsorship from a variety of agencies, industries, and individuals.