This study sought to determine whether a secondary level curricular model based on enhancing knowledge and awareness of global forest issues would have an effect on students' self-perceived knowledge of forest issues, actual content knowledge of these issues, and pro-environmental attitudes. The study instrument is the secondary module "Global Connections: Forests of the World", a publication of the American Forest Foundation and part of its Project Learning Tree series of curricula. The module activities provide students with opportunities to apply scientific processes and higher order thinking skills while investigating world forestry issues and conducting service-learning action projects. Overall, the use of Forests of the World as a curriculum to teach about forest issues seems to be effective in increasing student attitudes and self-assessed knowledge about forests. There is some indication that the curriculum increases content knowledge as well.