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“Evolution of Organic,” a new documentary by San Francisco filmmaker Mark Kitchell, details the origins of a movement that grew out of the vision of West Marin food producers, among others.     Courtesy of Mark Kitchell

The organic food movement exploded in the early ’80s after a representative from Berkeley’s Chez Panisse visited Bolinas with a peculiar request. As detailed in a new documentary by San Franciscan filmmaker Mark Kitchell, forager Sibella Kraus came out to Star Route Farm in search of ingredients for a mesclun—a Provencal salad of small, leafy greens—and her desire left farmer Warren Weber exasperated. “I pointed at one field where there were tiny greens and said…