Yvon Chouinard, the short, bluff, fatalistic founder of Patagonia, the company renowned for its pricey parkas, fuzzy fleeces, and exhortations to buy fewer of them, sits in a cafeteria-style Chinese restaurant in Jackson, Wyo. He scratches a clam from its shell, forks it into his mouth, chews, checks the time. “Oh, we’re fine,” he says, and Birgit Cameron, seated on his right, does her best to look reassured. A fairly recent addition to the Patagonia…