The Princeton Review named three University of California campuses to its 2011 Green Rating Honor Roll for tallying the highest score in the publication's measure of a college's environmental friendliness.

UC Berkeley, UC Santa Barbara and UC Santa Cruz scored a 99, the highest score possible, along with 15 other universities in Princeton Review's survey of 703 institutions across the country. The Green Rating Honor Roll is posted on the publisher's website  and green ratings of all 703 universities will be published in three guidebooks - "The Best 373 College Campuses," the "Complete Book of Colleges" and "The Best Northeastern Colleges."

"We commend the administrators, faculty and students at the schools on our Green Rating Honor Roll for their exemplary commitments to the environment," said Robert Franek, Princeton Review's senior vice president and publisher.

Princeton Review looks at three criteria for its green ratings: whether a university's students have a campus quality of life that is healthy and sustainable, how well the university is preparing its students for employment and citizenship in a world defined by environmental challenges, and the university's overall commitment to environmental issues.

Princeton Review cited UC Berkeley for its pledge to reduce greenhouse gas emissions to 1990 levels by 2014 (six years sooner than the goal UC set in its systemwide sustainability policy, its sustainable food service practices, green academic programs and efforts to cut energy use.

Having the most LEED-certified green buildings within the UC system helped UC Santa Barbara make the honor roll. Princeton also cited Santa Barbara's efforts to reduce energy consumption, sustainable practices in its housing department and in food services.

The publisher recognized UC Santa Cruz's history of being a leader in sustainability. UC Santa Cruz also received a top ranking for procuring 20 percent of its energy from renewable sources and diverting 70 percent of its waste away from landfills.