答案

Firstly and most importantly, the school should discourage on-campus parking, as on campus parking is a threat to on-campus environment. On one hand, the exhaust emission deteriorates the air quality and thus makes on-campus life unpleasant. Also, on-campus driving increases the chance of car accidents and threatens the safety of teachers and students. On the other hand, the noise of driving and car alarms is a distraction to students who are focusing on study and professors dedicated to researches. Besides, the school can hire more cleaners or advocate students to clean the campus.