San Francisco and Oakland are suing Chevron , ConocoPhillips , ExxonMobil , BP and Royal Dutch Shell —the five biggest investor-owned fossil fuel producers in the world—over the costs of climate change . The two Californian cities join the counties of Marin, San Mateo and San Diego and the city of Imperial Beach that have taken similar legal action in recent months, the San Francisco Chronicle reports. San Francisco city attorney Dennis Herrera and Oakland city attorney Barbara J. Parker filed separate lawsuits on Tuesday in the superior courts of San Francisco and Alameda County on behalf of their respective cities. They seek to hold the companies responsible “for the costs of sea walls and other infrastructure necessary to protect San Francisco and Oakland from ongoing and future consequences of climate change and sea level rise caused by the companies’ production of massive amounts of fossil fuels,” according to […]