The record-breaking heatwaves, hellish wildfires and biblical floods that have hit the world in recent weeks have suddenly made terrifyingly real some of the more extreme warnings of climate change campaigners. So perhaps it should be no surprise that some financial firms are contemplating more extreme actions to show their commitment to the fight against global warming.

I am told that several leading wealth managers are considering drawing up a blacklist of shares that they would refuse to buy for clients, even on an execution-only basis, because the companies’ policies on climate change were deemed unacceptable.