Over the past five years I have become increasingly concerned at the scaremongering of the climate alarmists, which has led the governments of Europe to commit themselves to a drastic reduction in carbon emissions, regardless of the economic cost of doing so. The subject is such a complex one, involving science, economics and politics in almost equal measure, that to do it justice I have written a book, albeit a short one, thoroughly referenced and sourced. But the bare bones are clear.

First, given the so-called greenhouse effect, the marked and largely man-made increase in carbon dioxide concentrations in the earth's atmosphere has no doubt contributed to the modest 20th century warming of the planet. But what remains a matter of unresolved dispute among climate scientists is how great a contribution it has made, compared with the natural factors affecting the earth's climate.