A new UNESCO designation is putting the Georgia swamp on the world stage, bringing opportunities for tourism, investment and conservation. But not everyone is supportive.By Ryan KrugmanFOLKSTON, Ga.—This quiet town of about 4,800 people has a humble Southern charm. Its low-slung storefronts, historic buildings and broad, quiet streets give it the feel of a place where time moves a little slower. At a viewing platform beside railroad tracks that pass a few yards from Main Street, train enthusiasts gather to watch 60 freight trains a day rumble through Folkston, carrying the goods that keep the rural Southern economy moving.