Grapes of Wrath
"There is a fifteen-fold difference in the price of cabernet sauvignon grapes that are grown in Napa Valley and cabernet sauvignon grapes grown in Fresno" in California’s hot Central Valley, says Kim Cahill, a scientist researching climate change's effect on viticulture who has also done consulting for the wine industry. "Cab grapes grown in Napa sold [in 2006] for $4,100 a ton. In Fresno, the price was $260 a ton. The difference in average temperature between Napa and Fresno was five degrees Fahrenheit."
Interesting read on climate change, wine and agriculture via Mother Jones.