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Page last updated at 11:27 GMT, Thursday, 24 June 2010 12:27 UK

Climate change's 'hockey graph'

Panorama reporter Tom Heap meets Professor Michael Mann, the scientist behind the graph that has fuelled much of the climate change controversy. The so-called hockey stick graph shows global temperature rising steeply over the last century - coinciding with man's ramped up industrialisation. Its accuracy has been disputed by climate change skeptics.

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

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