The six institutions in our four states: Iowa: Luther College, University of Iowa, University of Northern Iowa Kansas: Kansas State University Missouri: Drury University Nebraska: Creighton University  The Princeton Review in partnership with the U.S. Green Building Council has released “The Princeton Review’s Guide to 286 Green Colleges,” an in-depth look at the most environment-friendly universities. The guide includes a compilation of “green highlights” and “green facts” about each school, justifying its inclusion. The Princeton Review says the list is…