A center of the Norwegian whaling industry in the last century, today a remnant of the far-flung British Empire, South Georgia is a splendid if forbidding land of towering, glacier-clad mountains and a treacherous, storm-torn coast punctuated by sheltered bays. During its brief polar summer, the island's verdant shoreline offers Antarctic wildlife a place to feed, mate, and rear their young. The only humans on the scene, the Carrs have learned intimate...