Chevron gasoline pump Litigation by local governments in the U.S. including New York City, Boulder, Colorado, and eight California cities and counties is a new front in the global fight against climate change. (Photo: Luke Sharrett/Bloomberg)

(Bloomberg) – BP Plc, Exxon Mobil Corp. and Chevron Corp. escaped blame for the public costs of global warming when a U.S. judge ruled that lawsuits by cities against oil companies aren't the answer to climate change.

"The problem deserves a solution on a more vast scale than can be supplied by a district judge or jury in a public nuisance case," U.S. District Judge William Alsup wrote Monday in dismissing complaints by the cities of San Francisco and Oakland, California.

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