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Harvard Researchers Say Exxon Misled Public on Climate Science

The logo of Exxon Mobil Corporation is shown on a monitor above the floor of the New York Stock Exchange in New York, December 30, 2015. REUTERS/Lucas Jackson/File Photo

Supran and Oreskes said that while, as early as 1979, Exxon scientists acknowledged burning fossil fuels was adding more carbon dioxide to the atmosphere and causing global temperatures to rise, the company's position in newspaper ads remained significantly different by consistently asserting doubt about climate science.