Take a look at Matthew Booker's Down By The Bay: San Francisco's History Between the Tides. It has a great chapter on agriculture in the SF Bay Delta. Also, the intro to Arthur McEvoy's The Fisherman's Problem is a good way to think about marine ecosystems in CA. Maybe a chapter from Josh Howe's Behind the Curve could be useful for your climate change segment? Just some suggestions--hope they help!
Stacy N Roberts, UC Davis