(CaliforniaWatch) - Farmers have always been gamblers, long accustomed to betting on the probabilities of the weather. But for the Napa Valley, where the temperatures have been ideal for the wine industry, the changes could be significant. “They’re used to rolling the dice every year,” said Stuart Weiss, a conservation biologist and chief scientist at the Creekside Center for Earth Observation, which assists growers and municipalities dealing with the disruptions caused by the changing climate. “Now, though, climate change is stacking the dice.”