Measured from the top of one of the 132-foot propellers, its massive new windmill stands 396 feet tall and is visible for miles, including from Highway 101 4 miles south of Greenfield. All the grape must is composted, drip irrigation covers the expanse, and more than 250 owl boxes provide homes to raptors ready to play exterminator, no chemicals needed. More than 2,000 California wine grape growers and winemakers already participate in the CSWA program, representing nearly 70 percent of the state's wine acreage and 80 percent of case production. The nonprofit CSWA has been around since 2002, established by fellow nonprofit Wine Institute and the California Association of Winegrape Growers, and its certified sustainable grape-growing program, with verification from a third-party auditor, started in 2010. A study conducted by market research firm Wine Opinions published earlier this year confirms what wineries active in sustainability programs have been reporting for years: demand for sustainably produced wine has increased over the past 10 years and is likely to continue to grow over the next decade. The findings — based on responses from 457 members of its national trade panel (distributors, retailers, restaurateurs and members of the media) in 36 states — included: Integrated pest management, water conservation and natural resource management all ranked as priorities; "The trade's interest in sustainably grown and produced wines is a positive for the California wine industry, which has adopted sustainable practices on a large scale," she says. California wines selling for $10 and above are showing growth, accounting for 19 percent of the volume and 40 percent of the value in domestic food stores. “Consumers worldwide recognize the high quality of California wines from diverse regions across the state,” says Wine Institute President and CEO Robert P.