This story was originally published by the Guardian and the Correspondent and is reproduced here as part of the Climate Desk collaboration.

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.

However, since then, the company has invested heavily in highly polluting oil reserves and helped lobby against climate action, leading to accusations that Shell knew the grave risks of global warming, but did not act accordingly.