How does a vintner know that the grapes are ripe? By the traditional method, they taste the grapes themselves. Like this: put the grape in your mouth, bite into it, let the juice run out and in doing so determine the sugar and alcohol content. And it is precisely the latter that could become an issue in the traditional growing regions over the next few years and decades. According to a study by the University of Bern, the grape harvest in Burgundy has been starting 13 days earlier on average than it has in the past six centuries.
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