The oil giant Shell issued a stark warning of the catastrophic risks of climate change more than a quarter of century ago in a prescient 1991 film that has been rediscovered. Shells 28-minute film, called Climate of Concern ... warned of extreme weather, floods, famines and climate refugees as fossil fuel burning warmed the world. A separate 1986 report, marked confidential and also seen by the Guardian, notes: The changes may be the greatest in recorded history. The predictions in the 1991 film for temperature and sea level rises and their impacts were remarkably accurate. Shell was one of the first major oil companies to accept the reality and dangers of climate change. But, despite this early and clear-eyed view of the risks of global warming, Shell invested many billions of dollars in highly polluting tar sand operations and on exploration in the Arctic. It also cited fracking as a future opportunity in 2016, despite its own 1998 data showing exploitation of unconventional oil and gas was incompatible with climate goals. Shell ... is estimated to have spent $22m in 2015 lobbying against climate policies, [and] has also been a member of industry lobby groups that have fought climate action. Another oil giant, Exxon Mobil, is under investigation ... for allegedly misleading investors about the risks climate change posed to its business. In early 2016, a group of congressmen asked the Department of Justice to also investigate whether Shells actions around climate change violated federal law.