The Go Green Database
"Check out our searchable, resource-packed Go Green Database, which features links to innovative classroom projects, service-learning opportunities, green curricula, lesson plans, and online tools. Search by topic, grade level, cost, or location. You also can contribute your favorite green online-education resources -- look for the "Contribute" link on the Go Green Database home page, and we invite you to rate, browse, and discuss the resources in this ever-expanding green repository. Hopefully, green awareness and activism will become a permanent feature of all our lives."
Taking Class Outdoors with Environmental Education
Take a look at Minnesota's School for Environmental Studies.