Children and Nature Network

The Children and Nature Network is an amazing resource for anyone interested in getting kids outside. Check out their website here:
http://www.childrenandnature.org

The Network provides news and media related to environmental education, helpful resources and toolkits, and a forum for discussion.
Especially for a high school-age crowd of environmental leaders, there are a few things on this site that should really be checked out:

-The network's Movement Directory is just as wonderful as it sounds. Campaigns, clubs, organizations, programs, and people are all listed often with websites and email addresses. Users can even search the listings by state in order to get in touch with movements nearby them.
http://www.childrenandnature.org/directory/ 

-The Natural Leaders Network connects a worldwide group of teenagers interested in educating younger kids. Anyone can register in just a few seconds by clicking the link labeled "Sign Up" on the right side of their page. Registering allows you to download the Natural Leaders Network Tool Kit.
http://www.childrenandnature.org/movement/naturalleaders/