Comparative wine production statistics for China are a bit problematic because much of the wine produced is not pure grape wine but may be mixed-fruit wine, and the rules on what can be labeled Chinese wine are quite, er, flexible.

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The latest is Sol Rouge, which Kane opened at the end of April with a focus on producing wines from the grape varietals of southern France's Rhone and Bordeaux regions, sourcing the fruit from his 70-acre vineyard in the Red Hills north of Napa.

BBC: San Francisco��s urban wine renewal

The French-style home sits on under an acre, onto which is also packed a small cabernet sauvignon grape vineyard, fruit trees, areas for entertaining, a pool and a guest house.

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