Friday Lecture Series: Global Warming Perspectives. April 18, 7 p.m., College of Southern Maryland, Leonardtown Campus, Building A Auditorium, 22950 Hollywood Road, Leonardtown. In recognition of Earth Day, the College of Southern Maryland is hosting a discussion on global warming as part of its Friday Lecture Series. CSM professors Tom Russ and Arthur Viterito will present generally accepted and alternative theories on climate science and why the planet is warming. Learn about the scientific, social and economic impact of global warming. Question and answer session to follow. Free. 301-934-7703 or 301-870-2309, Ext. 7703 for Charles County; 240-725-5499, Ext. 7703 for St. Marys County or 443-550-6169, Ext. 7703 for Calvert County or visit www.csmd.edu.