As someone who is concerned about climate change and reasonably well informed about it, but genuinely interested in what sceptics have to say, I read this book hoping to learn more. Some hope. To say that Delingpole is cavalier with the evidence is an understatement. Whenever I came across anything I already knew something about, it was clear that he had either ignored crucial evidence, misunderstood it, or interpreted it in a totally biassed way.
To critics who say he doesn't understand the science, he replies he doesn't need to, because his reading enables him to make connections (between climate science and "a neo-Marxist plot to takeover the world") which elude lesser mortals. All one can say is that his reading has been extremely selective, and doesn't seem to include climate scientists (or "neo-Marxists", for that matter).
To take just one example of Delingpole's approach, he argues at different points in the book that global warming isn't happening, that it is happening but it's not due to human activity, and that it is happening and it's a good thing (because we would all like to live in a warmer climate). I suppose consistency is not a requirement if all you're interested in is exposing a supposed plot to justify more state controls over the pursuit of individual freedom.
I laughed out loud when he claimed, towards the end of the book, that having absorbed his wisdom, you are "now better informed than almost anyone you know" about climate science! All that I had learnt by the end was about the fantasy world that conservative libertarian conspiracy theorists inhabit.
Read this book if you want your prejudices confirmed (whether these are that global warming is a myth, that climate science is part of a socialist plot to takeover the world, or, indeed, that all climate sceptics are cranks). Don't expect to learn anything of value, though.