It was delightfully appropriate that, as large parts of Argentina were swept by severe blizzards last week, on a scale never experienced before, the city of Nashville, Tennessee, should have enjoyed the coolest July 21 in its history, breaking a record established in 1877. Appropriate, because Nashville is the home of Al Gore, the man who for 20 years has been predicting that we should all by now be in the grip of runaway global warming.

His predictions have proved so wildly wrong – along with those of the Met Office’s £33 million computer model which forecast that we should now be enjoying a “barbecue summer” and that 2009 would be one of “the five warmest years ever” – that the propaganda machine has had to work overtime to maintain what is threatening to become the most expensive fiction in history.