This video from Britain says about itself:
What Shell knew about climate change in 1991 – video explainer
28 February 2017
• Shell’s 1991 warning: climate changing ‘at faster rate than at any time since end of ice age.
Translated from Dutch NOS TV:
Shell knew and denied hazards of global warming
Already in 1986, Shell warned in a confidential report about the serious consequences of climate change caused by CO2 emissions. [Dutch news site] De Correspondent writes today in a reconstruction based on internal documents, also appearing in The Guardian.
Then already they concluded that the use of fossil fuels contributes in a big way to global warming. However, the multinational corporation since then hardly changed its course and Shell almost exclusively invests in fossil fuels, says Jelmer Mommers, the journalist who has worked for the story in De Correspondent, in NOS Radio 1 news.
The Shell report from 1986 states that global warming could cause parts of the earth to become uninhabitable. It also warned of flooding, extreme weather and migration flows, in short, “changes that will prove the biggest in history,” Mommers quotes from the document. …
Despite the concerns expressed Shell waited until 1997 for their first paces in the direction of renewable energy, under then CEO Jeroen van der Veer. “But they found out that they there not good at that and that the playing field for clean energy is different,” says Mommers. So the greening rate remained until today limited to 1 percent of the total investments by Shell.
Completely contradictorily to their own early warnings Shell supported in the 1990s a campaign of US oil and coal companies to sow doubt and confusion about the findings of climate scientists who described the dangers of global warming. The campaign was intended to prevent government intervention against polluting energy. …
“Documents show that to Shell the climate debate is important,” says Mommers. “But the tragedy is that they obviously are unable to change in a way that is consistent with their own early warnings.”
See also here.