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Two views: Global warming

Panorama brought together leading 'environmental sceptic' Bjorn Lomborg to meet Bob Ward, of the London School of Economics, who campaigns to halt global warming. Reporter Tom Heap asked them both to talk through exactly what they believe using Panorama's "Wall of Certainty".

Panorama: What's Up With the Weather? BBC One, Monday, 28 June at 2030BST.

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