Vineyards in Northern California began planting thousands of acres of new vines in 2016, and with more efficient harvesting methods, it has led to more bountiful harvests of grapes. Having more grapes to make wine sounds good, but if there’s not enough demand to support increased production, the surplus grapes go to waste. Jeff Bitter, president of Allied Grape Growers, told CNN that it’s possible for surplus grapes to make it to the secondary market, where they’re used for brandy or as grape concentrate. But that market doesn’t typically provide sustainable returns for growers. “The main cause of oversupply today...