Yale Environment 360: The San Francisco Bay was once one of the richest estuaries in North America. Almost completely enclosed and protected from the open ocean, and with more than 200 freshwater creeks feeding into it, it was a fertile refuge for young salmon, halibut, sturgeon, anchovy, and smelt. It was lined with some 200,000 acres of tidal marsh, and the connected Sacramento Delta doubled that, creating a region so rich and productive it was known as the Everglades of the West. By the middle of the 20th century,...