The Danish company behind Revolution Wind, a $6 billion project off Rhode Island, said the federal government had unlawfully halted work on the wind farm.

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The administration is cranking up efforts to kill state laws and legal cases that would force fossil-fuel companies to pay for climate damage.

© Hilary Swift for The New York Times

The oil giant accused the state’s attorney general and four nonprofit groups of defamation after they sued over recycling claims.

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