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Napa Valley and Bordeaux at tipping point on global warming?

Fresh concerns about a climate ‘tipping point’ for Napa Valley and Bordeaux red wines have been raised by scientists, after analysing temperature and grape data. Writing in the Oeno One journal, researchers said climate data showed a significant increase in average growing season temperatures in both Napa and Bordeaux, particularly since the 1980s.

So far the warmer conditions have generally contributed to better average wine quality, noted the authors, from the University of Bordeaux’s ISVV Institut des Sciences de la Vigne et du Vin and UC Davis. However, analysis on five vintages of California Cabernet Sauvignon found that higher sugar levels in grapes could lead to loss