Executives at ExxonMobil continued in recent years to raise doubts internally about the dangers of climate change and the need to cut back on oil and gas use, even though the company had previously conceded publicly that burning fossil fuels contributes to global warming, according to a report in The Wall Street Journal. The effort to minimize concerns about climate change under former chief executive Rex Tillerson, who led Exxon from 2006 until 2016, was happening at the same time that scientists at the company were modeling troubling increases in…