I found a great downloadable fact sheet on the benefits of nature. Click here to download it. Much of what I am reading about nature-deficit disorder is on this fact sheet.
Chawla, L., & Cushing, D. F. (2007).
Benefits of nature for children's health, Fact Sheet #1, April 2007.
Children, Youth and Environments Center for Resarch and Design.
Retrieved January 18, 2012 from http://www.peecworks.org/PEEC/PEEC_Research/S01798C0C-01798C1A.
Click here for much more research on place-based education.