Public information film unseen for years shows Shell had clear grasp of global warming 26 years ago but has not acted accordingly since, say critics

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.

Related: Shell’s 1991 warning: climate changing ‘at faster rate than at any time since end of ice age’

Related: Exxon knew of climate change in 1981, email says – but it funded deniers for 27 more years

Related: Nick Stern: Shell is asking us to bet against the world on climate change

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