France’s longstanding wine traditions have come under scrutiny following a recent rule change in the United Kingdom permitting winemakers to add acid to their wines for the 2023 vintage. The UK government authorized this measure in response to record-breaking summer temperatures, which have affected the natural acidity of grapes.

This summer, average temperatures in the UK reached 21.3 degrees Celsius, surpassing the previous high of 21 degrees Celsius set in 1976. The unusually warm weather accelerated the breakdown of malic acid in grapes, causing a rise in the wine’s pH level. As a result, some British vintners faced concerns over the preservation of flavor and the risk of spoilage from harmful bacteria and yeasts, which can proliferate when acidity is insufficient. To mitigate these issues, the Department for Environment, Farming and Agriculture (Defra) issued a directive on October 2 allowing the addition of up to four grams of tartaric acid per liter of wine.

While the practice of acidifying wine is common in traditionally warmer regions such as California, Australia, and Argentina, it has not been standard procedure in the UK. English vineyards have historically been situated in Europe’s coolest wine-growing zones, classified as zones A and B, where acid adjustment was unnecessary and prohibited. This shift has sparked debate among winegrowers, particularly those in France, who emphasize the importance of maintaining wine’s connection to its natural environment, or “terroir.”

Charles Philipponnat, whose family has cultivated vines in the Champagne region for more than five centuries, expressed reservations about the British adjustment. He described the addition of acid as conflicting with the goal of producing wines that authentically reflect their terroir. “We pride ourselves on not acidifying nor de-acidifying because we reckon it is entering an artificial or industrial process,” Philipponnat said, adding that his family has never resorted to such measures in nearly three decades of winemaking. He stressed that vintages may vary naturally but should not be artificially modified to compensate for weather fluctuations.

In contrast, proponents of the UK government’s decision argue that the measure responds pragmatically to changing climatic conditions. Stephen Skelton, a master of wine, noted that although acidification was previously unnecessary in the UK, rising temperatures are making it essential for some winegrowers to ensure consistency and quality across vintages.

The move has highlighted tensions between traditionalist approaches rooted in centuries-old practices and adaptation to global climate shifts affecting viticulture worldwide. Defra declined to comment further on the policy.