"The hockey stick is alive and well"
A new study by climate scientists behind the controversial 1998 "hockey stick" graph suggests their earlier analysis was broadly correct.
Michael Mann's team analysed data for the last 2,000 years, and concluded that Northern Hemisphere temperatures now are "anomalously warm".
Different analytical methods give the same result, they report in Proceedings of the National Academy of Sciences.
UPDATE : Study is now online here http://www.pnas.org/content/early/2008/09/02/0805721105.full.pdf+html
The 1998 hockey stick was a totem of debates over man-made global warming. ...But some academics questioned its methodology and conclusions, and increasingly strident condemnations reverberated around the blogosphere....
Michael Mann's conclusion is that far from being broken, "the hockey stick is alive and well".
I'll be keeping an eye on the obituary writer..
Update - More details at Mongabay which unlike the BBC gives the citation:
Mann et al. (2008). Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia. PNAS September 9, 2008 vol. 105 no. 36
Composite "composite plus scale" (CPS) methodology and "error-in-variables" (EIV) regression method ("total least squares") North Hemisphere (NH) land and land plus ocean temperature reconstructions and estimated 95% confidence intervals. Shown for comparison are published NH reconstructions, centered to have the same mean as the overlapping segment of the CRU instrumental NH land surface temperature record 1850 - 2006 that, with the exception of the borehole-based reconstructions, have been scaled to have the same decadal variance as the University of East Anglia (Norwich, UK) Climatic Research Unit instrumental surface-air temperature data (CRU) series during the overlap interval. Image courtesy of National Academy of Sciences, PNAS (© 2008).