11:30 a.m.-1 p.m. – Charles Seabrook, author and columnist, will talk about his new book, “The World of the Salt Marsh” at the Dunwoody Nature Center. Seabrook has written extensively on global warming, air and water pollution, and songbird decline. “The World of the Salt Marsh” is an exploration of the southeastern coast—its natural history, its people and their way of life, and the historic and ongoing threats to its ecological survival. Lecture $5; lecture and boxed lunch, $15. For adults, seniors. Space is limited; reservations and payments are on a first-served basis. Register at www.dunwoodynature.org or by calling 770-394-3322. 5343 Roberts Dr., Dunwoody, 30338.