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Michael Mann says hockey stick should not have become ‘climate change icon’

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Louise Gray
London Telegraph
Tuesday, June 29, 2010

The scientist behind the controversial ‘hockey stick’ graph has said it was ‘somewhat misplaced’ to make his work an ‘icon of the climate change debate’.

Professor Michael Mann plotted a graph in the late 1990s that showed global temperatures for the last 1,000 years. It showed a sharp rise in temperature over the last 100 years as man made carbon emissions also increased, creating the shape of a hockey stick.

The graph was used by Al Gore in his film ‘An Inconvenient Truth’ and was cited by the United Nations body the Intergovernmental Panel on Climate Change (IPCC) as evidence of the link between fossil fuel use and global warming.

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But the graph was questioned by sceptics who pointed out that is it impossible to know for certain the global temperature going back beyond modern times because there were no accurate readings.

The issue became a central argument in the climate change debate and was dragged into the ‘climategate’ scandal, as the sceptics accused Prof Mann and his supporters of exaggerating the extent of global warming.

  • A d v e r t i s e m e n t

However, speaking to the BBC recently, Prof Mann, a climatologist at Pennsylvania State University, said he had always made clear there were “uncertainties” in his work.

Full story here.

This article was posted: Tuesday, June 29, 2010 at 7:55 am





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