As if French winemakers didn't have enough problems. An economic slump is slashing sales and they're facing ever-tougher competition from New World winemakers, who have greater freedom to design their wines to suit a fickle public. Now they have to grapple with climate change, which threatens to redraw the map on global wine production. After three decades of rising average temperatures, Central France's cooler Burgundy region is more like the balmy Rhône, in the south; Bordeaux is as warm as Barcelona. Winemakers today face a choice: Adapt or go out of business.