Leaked documents show Exxon knew about climate change as early as 1977 when climate scientist James F. Black made this statement to Exxon execs “In the first place, there is general scientific agreement that the most likely manner in which mankind is influencing the global climate is through carbon dioxide release from the burning of fossil fuels”.
Continued investigations by their own scientists led to an estimation in 1980 that doubling atmospheric CO2 would increase global temperatures by 2 to 3 degrees Celsius.
Their response was to bury their own findings and spend millions financing junk science in an effort to discredit data showing anthropomorphic climate change.
They have not improved much it seems. They denied climate was happening while internally factoring it into arctic operations where the melting of ice as a result was helping them reach arctic reserves.