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Percentage of California winery sustainability certifications possessed by the Napa Valley, even though the valley compromises just 16% of the state’s vineyard acreage. Of the 550 wineries, 70% are now certified by Napa Green, the region’s stringent environmental program. The valley was also the first (and remains the only) wine region in the U.S. to legally structure itself as an Agricultural Preserve—in 1968.