Add the San Francisco Board of Supervisors to the list of cities and universities encouraging divestment from Big Oil and other fossil fuel securities. Jumping ship on fossil fuel stocks may be the latest investing trend, but does it affect everyday people? In this video, Fool.com contributor Aimee Duffy talks with Tyler Crowe to take a closer look at the San Francisco story, and how the divestment trend may affect you, even if you don't think you own shares of Big Oil.