Three teacher resources focusing on the interrelated concepts of the environment, development and equity (for middle - high school students). Sample lessons and ordering information are available.
The URL is: http://www.globallearningnj.org/

Solid waste curricula (K-12 and Higher Ed) which "incorporate Native American cultural themes to help sensitize students to environmental issues and inspire greater participation in community pollution prevention activities." From EPA's Tribal Solid Waste Management Program (some resources are available for download in PDF format).
The URL is: http://www.epa.gov/tribalmsw/educout.htm

The Eco-Pals program is a pen pal program with an environmental theme. Register before September 30, and you will be provided with a 'twinned' class and three assignments to help your students write important and enjoyable correspondences. The program is available to K to 9 classes in Canada. In French and English.
The URL is: http://www.green-group.com/

Outside My Window is a project started by an international relations educator at Evergreen Valley High School in California. This project is designed to help students connect with other people around the world by exchanging photos taken through the windows of their houses and classrooms. To keep this broad and international, the learning standards are from the National Council on Social Studies and fit in with many local standards.
The URL is: http://www.outsidemywindow.org/