ST. HELENA, CA – JULY 12: Wine grapes are seen on a grape vine July 12, 2006 at St. Supery’s Dollarhide Ranch in St. Helena, California. A study published in the Proceedings of the National Academy of Sciences, suggests that rising temperatures brought on by global warming could wipe out California’s rich wine regions in Sonoma, Napa and Santa Barbara counties by the end of the century. (Photo by Justin Sullivan/Getty Images)