This Jan. 30, 2012, file photo, shows a sign at an Exxon Mobil refinery in California. On Jan. 5, 2018, the company announced its discovery of a major oil reservoir offshore of Guyana. (AP Photo/Reed Saxon, File)
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This Jan. 30, 2012, file photo, shows a sign at an Exxon Mobil refinery in California. On Jan. 5, 2018, the company announced its discovery of a major oil reservoir offshore of Guyana. (AP Photo/Reed Saxon, File)
