IN 2006, former US vice-president Al Gore made a movie and companion book about global warming called An Inconvenient Truth. Gore undertook many speaking tours to publicise his film, and his PowerPoint slide show has been shown by thousands of his acolytes spreading a relentless message of warming alarmism across the globe.

But while audiences reacted positively and emotionally to the film's message - which was that human carbon dioxide emissions are causing dangerous global warming - some independent scientists pointed out that An Inconvenient Truth represented well-made propaganda for the warming cause and presented an unreliable, biased account of climate science.

For nowhere in his film does Gore say that the phenomena he describes falls within the natural range of environmental change on our planet. Nor does he present any evidence that climate during the 20th century departed discernibly from its historical pattern of constant change.

In early February 2007, the Department for Education and Skills in Britain, apparently ignorant that the film was scientifically defective, announced that all secondary schools were to be provided with a climate change information pack that contained a copy of Gore's by then notorious film. Many parents were scandalised at this attempt to propagandise their children on such an important environmental issue.

One parent, school governor Stuart Dimmock who had two sons at a state school in southern England, took legal action against the secretary for education in the High Court, and sought the film's withdrawal from schools.

In a famous judgment in October 2007, Justice Burton, discerning that Gore was on a "crusade", commented that "the claimant substantially won this case", and ruled that the science in the film had been used "to make a political statement and to support a political program" and that the film contained nine fundamental errors of fact out of the 35 listed by Dimmock's scientific advisers. Justice Burton required that these errors be summarised in new guidance notes for screenings.

In effect, the High Court judgment typed Gore and his supporters as evangelistic proselytisers for an environmental cause.

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