What is Project Learning Tree (PLT)? 
Project Learning Tree® (PLT) is an international, award-winning environmental education curriculum designed for all educators. The program has been in existence since the mid 1970’s and was introduced to Virginia in 1981. PLT is engineered to help educators weave the environment into their everyday lesson plans. All activities are field-tested by teachers, reviewed by experts, and are correlated to the Virginia Standards of Learning. PLT materials are available by participating in PLT workshops.