BBC discusses how the oil industry made us doubt climate change. As climate change becomes a focus of the US election, energy companies stand accused of trying to downplay their contribution to global warming. In June, Minnesota’s Attorney General sued ExxonMobil, among others, for launching a “campaign of deception” which deliberately tried to undermine the science supporting global warming. So what’s behind these claims? And what links them to how the tobacco industry tried to dismiss the harms of smoking decades earlier?