Hotter summers in Bordeaux are making winemakers and farmers weary of whether their grapes will survive global warming.  Since 1950, the average temperature in Bordeaux has risen close to four degrees Fahrenheit.   Due to the scorching summer heat, farmers in this region began picking their grapes earlier so they did not over-ripen.  The fruit becomes too sweet and too ripe leaving a less acidic, more alcoholic wine which is not comparable to the traditional wine of Bordeaux.  This, unfortunately, causes an imbalance in the maturation of the grape leading to less preferred wine.