Global warming, increasing wildfire risk threaten viability of some California winery regions

The U.S. is the fourth-largest wine-producing country by output volume, and approximately 80% of its production occurs in California.

Ever since the 19th century, California's premier wine-growing regions have been the Napa Valley and Sonoma County, thanks to their favorable microclimate.

But grape yield and quality are very sensitive to the local environment, which means the climate crisis could shake up California's wine industry. ...