"This paper assesses whether ExxonMobil Corporation has in the past misled the general public about climate change. We present an empirical document-by-document textual content analysis and comparison of 187 climate change communications from ExxonMobil, including peer-reviewed and non-peer-reviewed publications, internal company documents, and paid, editorial-style advertisements ('advertorials') in The New York Times." See Assessing ExxonMobil's climate change communications (1977–2014) by Geoffrey Supran and Naomi Oreskes. Pdf here. Video abstract below.
"We conclude that ExxonMobil contributed to advancing climate science—by way of its scientists' academic publications—but promoted doubt about it in advertorials. Given this discrepancy, we conclude that ExxonMobil misled the public. Our content analysis also examines ExxonMobil's discussion of the risks of stranded fossil fuel assets. We find the topic discussed and sometimes quantified in 24 documents of various types, but absent from advertorials. "
Exxon have on going litigation in this area. Check out Exxon's 20-F for more and a recent NYT piece on the NY State litigation, In June 2017, “evidence suggests not only that Exxon’s public statements about its risk management practices were false and misleading, but also that Exxon may still be in the midst of perpetrating an ongoing fraudulent scheme on investors and the public.”