BERKELEY, Calif. — Goodbye, city park, hello, college green. As city officials around the country move to disband Occupy Wall Street encampments amid growing concerns over health and public safety, protesters have begun to erect more tents on college campuses. “We are trying to get mass numbers of students out,” said Natalia Abrams, 31, a graduate of the University of California, Los Angeles, and an organizer with Occupy Colleges, a national group coordinating college-based protesters. Though only a handful of colleges have encampments, tents went up last week at Harvard in Cambridge, Mass., and here at the University of California,...