In a vineyard on the Greek island of Santorini, winemaker Yiannis Boutaris gestures to a dried-up ‘kouloura’ vine trained into the shape of a basket to protect the grapes from the grueling summer sun. The plant endured for 90 years but was finally killed by heat and drought.

Santorini's famed vineyards face a crisis as extreme heat and drought decimate ancient vines, driving up grape prices and slashing wine production. Winemakers are now pioneering…

In a vineyard on the Greek island of Santorini, winemaker Yiannis Boutaris gestures to a dried-up ‘kouloura’ vine trained into the shape of a basket to protect the grapes from…