Mark Harris, former Los Angeles Times environmental columnist and author of Grave Matters: A Journey Through the Modern Funeral Industry to a Natural Way of Burial, will speak Saturday, February 13, beginning at 1:30 pm, in the Tapestry Room of the Isabella Stewart Gardner Museum, 280 The Fenway.  Green cemeteries that take an eco-friendly approach to burials and memorialization are springing up in North America, England, and Europe.  Permitting only chemical-free burials in biodegradable coffins, the new green graveyards allow the speedy decomposition of the body and its return to the natural cycle of life. At the same time, green cemeteries work to preserve land from development and, in the best of schemes, restore it to ecological health. Using archival images of early American cemeteries and recent photographs of green cemeteries here and abroad, Harris examines the history of natural burial, tracing its roots in the rural cemetery movement to current strategies for land preservation.  Tickets are $15 General Public, $12 Seniors, $5 Members of the Museum, and Free for students.  To purchase tickets in advance, or for more information, log on to www.gardnermuseum.org.