(TheDrinksBusiness) - Increasing alcohol levels among Napa Valley wines was attributed to viticulture and winemaking, not climate change, during a tasting of labels from the region in London yesterday.Speaking during the event, which was designed to show the evolution of Napa Valley Cabernet Sauvignon blends, Bruce Cakebread pointed out that high alcohol was a stylistic choice. Using the example of Shafer Vineyard’s Hillside Select Cabernet Sauvignon 2001, which achieved 14.9% abv despite the relatively cool vintage conditions that year, Bruce, president of Cakebread Cellars said, “The alcohol level is more stylistic than climate-based.”