Spending on advertising by major oil corporations has reached an all-time high over the past decade. In a recent paper in Climatic Change, researchers from McGill, Brown and Rutgers Universities tried to determine the factors that might explain this increase (from an average total annual expenditure of $35 million between 1986-1996 for the five biggest companies together to an average of $217 million annually between 2008-2016 for the same companies).