San Francisco Chronicle: The federal government is taking steps that may open California’s fabled coast to oil drilling in as soon as three years, an action that could place dozens of platforms off the Sonoma, Mendocino and Humboldt coasts along with the specter of spills, air pollution and increased ship traffic into San Francisco Bay. Millions of acres of oil deposits, mapped in the 1980s when then-Interior Secretary James Watt and Energy Secretary Donald Hodel pushed for California exploration, lie a few …