Rhode Island’s attorney general sued a dozen oil and natural gas companies and their affiliates Monday in state court, accusing them of causing climate change and not sufficiently mitigating its effects.  Attorney General Peter Kilmartin said Rhode Island is uniquely harmed by global warming, with its more than 400 miles of shoreline, fishing industry, marine economy and other factors...The defendants in the lawsuit include big companies across the petroleum supply chain, including Exxon Mobil Corp., Chevron Corp., ConocoPhillips Co., Marathon Oil Corp. and Hess Corp.  Kilmartin’s lawsuit is the first time that a state has sued fossil fuel companies to hold them responsible for the effects of climate change...