Each module has several activities, a lesson plan, an overview narrative, assessment tools with teacher answer keys, and a reflective exercise.  Links to references and resources are provided,   All of the modules are correlated with the national and state history and social studies standards.  One of the modules "From Forest to Farm to Urban Forest"  is place-based about the Duke Forest.  Another module is timely "From Arbor Day to Earth Day" that helps a student understand the effects of rapid industrialization on the environment and the emergence of the conservation movement and then compare it to the modern environmental movement.