This very weekend of September 2013, we were being told back in 2007, would be the moment when the Arctic was “ice-free”. Yet this summer’s ice-melt has been the smallest for nine years, and the global extent of polar sea ice is currently equal to its average over the past 34 years. Tuvalu and the Maldives are not vanishing beneath the waves. Far from hurricanes and tornadoes becoming more frequent and intense, their incidence is lower than it has been for decades. The Himalayan glaciers are not on course to have melted by 2035, as the IPCC’s last report predicted in 2007. Nothing has changed except that the IPCC itself, as the main driver of the scare, has been more comprehensively discredited than ever as no more than a one-sided pressure group, essentially run by a clique of scientific activists committed to their belief that rising CO2 levels threaten the world with an overheating which is not taking place.

But if the scientific case for their belief has disintegrated, the problem this leaves us with is the reason why I subtitled that book four years ago: “Is the obsession with climate change turning out to be the most costly scientific blunder in history?” The political leaders of the Western world, from President Obama to our own in the EU, are still as firmly locked into the alarmist paradigm as ever, quite impervious to all the evidence. As the EU’s “climate commissioner”, Connie Hedegaard, recently put it: “Let’s say that scientists several decades from now said, ‘We were wrong, it’s not about climate’, would it not in any case have been good to do many of the things you have to do to combat climate change?”