In 1867, John Muir set out on foot to explore the botanical wonders of the South, keeping a detailed journal of his adventures as he traipsed from Kentucky southward to Florida. One hundred and fifty years later, on a similar whim, veteran Atlanta reporter Dan Chapman, distressed by sprawl-driven environmental ills in a region he loves, recreated Muir's journey to see for himself how nature has fared since Muir's time. Channeling Muir, he uses humor,...