ExxonMobil, the world’s biggest oil company, knew as early as 1981 of climate change – seven years before it became a public issue, according to a newly discovered email from one of the firm’s own scientists. Despite this the firm spent millions over the next 27 years to promote climate denial.

The oil giant Exxon privately “predicted global warming correctly and skilfully” only to then spend decades publicly rubbishing such science in order to protect its core business, new research has found.

The Massachusetts high court on Tuesday ruled that the US’s largest oil company, ExxonMobil, must face a trial over accusations that it lied about the climate crisis and covered up the fossil fuel industry’s role in worsening environmental devastation.