In California’s Tomales Bay, Hog Island Oyster Co. uses marine biology to sustainably farm shellfish. It’s a zero-input crop that is helping to restore the water quality of the bay. The company founders are both marine biologists who focus on growing oysters in a manner that enhances the health of the ecosystem. Existing infrastructure is used when possible—many buildings from the 1860s and 1870s have been restored and incorporated into the farm.