An Inconvenient Truth or Hot Air? ; Everyone Agrees Global Warming Is a Terrible Fact of Life. Right? Wrong. A Film to Be Screened This Week Ridicules the Al Gore Orthodoxy. Geoffrey Lean Reports on the Green War

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After two decades, the long scientific and political debate over whether human activities are warming up the Earth is finally over. Or is it? The world scientific community says so. Even the most recalcitrant governments, including the Bush administration, reluctantly agree. But the British media is characteristically unwilling to let an old row simply fade away.

On Thursday, Channel 4 will screen what it calls a "polemical and thought-provoking documentary" - The Great Global Warming Swindle - by one of the environmentalists' favourite hate figures, film-maker Martin Durkin.

It follows hot on the heels of a decision by David Miliband, the Environment Secretary, …