We’ve know for a long time that oil giant Exxon was a key funder of the climate science denial movement in the United States.
Not as widely known was how, in the 1970s and early 80s, Exxon’s own scientists were warning of the dangers of burning fossil fuels. They even carried out their own modeling and experiments.
Inside Climate News and the LA Times have both had major investigative stories on this.
Here’s an excellent YouTube primer on this story from Peter Sinclair.