ORONO — Two schools in Maine have been named to the Princeton Review’s “green honor roll.”

The Princeton Review last week released its fourth annual green ratings of colleges measuring how environmentally friendly they are. Only 16 of the 768 institutions that were looked at received the highest rating, including the University of Maine at Orono and Bar Harbor’s College of the Atlantic.

The University of Maine was cited for its free shuttle service and providing free bicycles for use by faculty and students. It was also recognized for its recycling and sustainability programs and commitment to green buildings.

The College of the Atlantic was lauded for its carbon-neutral energy commitment and its organic food.