According to GreenReportCard.org, here is a list of the overall Top 26 Green Colleges in America:

Amherst College, Amherst, MA
Arizona State University, Tempe, AZ
Brown University, Providence, RI
University of California - San Diego, San Diego, CA
Carleton College, Northfield, MN
College of the Atlantic, Bar Harbor, ME
University of Colorado, Boulder, CO
Dickinson College, Carlisle, PA
Harvard University, Cambridge, MA
Luther College, Decorah, [...]