An Exxon sign at a mini-mart in Dormont, Pa. Exxon Mobil Corp. is fighting against government investigators who believe the company covered up knowledge of how fossil fuels contribute to climate change in this April 29, 2014 file photo. Exxon went to state court in Texas on Wednesday, April 13, 2016, to seek to quash a subpoena issued last month by the attorney general of the U.S. Virgin Islands. The company says the investigation violates its constitutional rights to speak freely and to be protected from unreasonable searches and seizures.(AP Photo/Gene J. Puskar, File)
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