The University of Iowa was ranked as one of the 322 most environmentally responsible colleges in the U.S. and Canada, according to the Princeton Review.

According to a release, this is the fourth year in a row that the UI was listed in the guide.

"We are pleased to be recognized once again for our efforts. We are making significant progress toward our Vision 2020 sustainability targets," said Liz Christiansen, the director of the UI Office of Sustainability.

The Princeton Review’s Guide to 322 Green Colleges highlights the school’s sustainability targets to achieve by 2020. Some of these targets include net negative energy growth, 60 percent waste-diversion, and 40 percent renewable-energy consumption.

The UI has six LEED-certified buildings on campus, 10 interdisciplinary faculty positions that have been created, and the undergraduate Certificate in Sustainability with 145 students enrolled.