Some good references we found:

http://www.smithsonianeducation.org/educators/lesson_plans/partners_in_pollination/index.html

Valuing Ecosystem Services: Toward Better Environmental Decision-Making (online book) http://www.nap.edu/catalog.php?record_id=11139

http://ga.water.usgs.gov/edu/watercycle.html

http://www.actionbioscience.org/environment/esa.html

Plan B 3.0 by Lester R. Brown

Nature's Services: Societal Dependence on Natural Ecosystems edited by Gretchen C. Daily