Replanting is done in phases, with old vines notably Chenin keeping up production while the new ones grow. At a South African wine farm, dry, uprooted grapevines are stacked at the bottom of a hilly stretch of brown fallow land. Much of the vineyard is being replanted to better cope with climate change, which is projected to bring rarer but more violent rainfall to this wine-loving corner of the world. From Australia to California, France, Spain and Italy, producers in wine-growing regions aroun...