In autumn of 2010, the University of Cincinnati maintained its position in green and sustainability initiatives by being named one of only 286 "Green Colleges" by The Princeton Review. The university has received this distinction each year since. UC was the only public university in Ohio and the only university in the Southern Ohio region included on this list. Some of the programs that helped achieve this distinction include: a bike share program where UC students can rent bikes from the university, an expanded recycling program, improved and expanded campus transportation options, the addition of vehicle charging stations, fuel pellet use in place of coal, greatly decreased energy and water use throughout campus, and the addition of 6 Leadership in Energy and Environmental Design (LEED) certified buildings since 2005. In 2007, former university president Nancy Zimpher signed the American College & University Presidents' Climate Commitment, which confirms the university's dedication to reducing its environmental impact and take the necessary steps to become climate neutral.