With a nod to Earth Day, the Princeton Review has released its guide to 322 of the greenest colleges in the United States, with help from the Center for Green Schools at
at the U.S. Green Building Council.

Robert Franek, senior vice president of publishing, said in a release that students have increasingly considered colleges' environmental footprints before committing to a school.

"Among 9,955 college applicants who participated in our 2013 'College Hopes & Worries Survey,' 62 percent said having information about a school's commitment to the environment would influence their decision to apply to or attend the school," he said.

The guide celebrates the most environmentally responsible colleges and universities in the country, making honorable mention of the top 21, which are included in the slideshow below.

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  • American University - Washington, D.C.

  • Arizona State University - Tempe, Ariz.

  • California Institute of Technology - Pasadena, Calif.

  • California State University, Chico

    <em>Photo by Shannon McCollum</em>

  • Catawba College - Salisbury, N.C.

  • Chatham University - East Pittsburgh, Pa.

  • College of the Atlantic - Bar Harbor, Maine

  • Columbia University - New York, N.Y.

  • Georgia Tech - Atlanta, Ga.

  • Goucher College - Towson, Md.

  • Green Mountain State College - Poultney, Vt.

  • Harvard University - Cambridge, Mass.

  • Northeastern University - Boston, Mass.

  • San Francisco State University - San Francisco, Calif.

  • University of California, Santa Cruz

  • University of South Carolina - Columbia, S.C.

  • University of Washington - Seattle, Wash.

  • University of Wisconsin, Oshkosh

  • University of Wisconsin Stevens Point

  • Vanderbilt University - Nashville, Tenn.

  • Warren Wilson College - Asheville, N.C.