Reposted from: http://en.wikipedia.org/wiki/Hockey_stick_graph
The hockey stick controversy is a dispute over the reconstructed estimates of Northern Hemisphere mean temperature changes over the past millennium especially the particular reconstruction of Mann, Bradley and Hughes, aka MBH98 reconstruction.
The lower graph was included in the 1990 Ist IPCC report. The Hocky Stick graph was included in the IPCC 2001 Third Assessement Report (pg 3) but not included in the IPCC 4th 2007 report.
More ....
In September 2008, Mann et al published an updated reconstruction of Earth surface temperature for the past two millennia.[61] Similarly to the original 1998 study, this work found that recent increases in northern hemisphere surface temperature are anomalous relative to at least the past 1300 years.
The debate continues...
No comments:
Post a Comment