Al Gore’s award-winning climate change documentary was littered with nine inconvenient untruths, a judge ruled yesterday.

An Inconvenient Truth won plaudits from the environmental lobby and an Oscar from the film industry but was found wanting when it was scrutinised in the High Court in London.

Justice Burton identified nine significant errors within the former presidential candidate’s documentary as he assessed whether it should be shown to school children. He agreed that Gore’s film was “broadly accurate” in its presentation of the causes and likely effects of climate change but said that some of the claims were wrong and had arisen in “the context of alarmism and exaggeration.”

In what is a rare judicial ruling on what children can see in the class-room, Justice Barton was at pains to point out that the “apocalyptic vision” presented in the film was politically partisan and not an impartial analysis of the science of climate change.

“It is plainly, as witnessed by the fact that it received an Oscar this year for best documentary film, a powerful, dramatically presented and highly professionally produced film,” he said in his ruling. “It is built around the charismatic presence of the former Vice President, Al Gore, whose crusade it now is to persuade the world of the dangers of climate change caused by global warming.

“It is now common ground that it is not simply a science film – although it is clear that it is based substantially on scientific research and opinion – but that it is a political film.”

The analysis by the judge will have a bearing on whether the Government can continue with its plan to have the film shown in every secondary school. He agreed it could be shown but on the condition that it was accompanied by new guidance notes for teachers to balance Gore’s “one-sided” views.