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Climate Change: The Evidence Mounts Up
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Last updated Friday 9 June, 2000 10:34 hrs EST
Climate Change: The
Evidence Mounts Up
Michael C. MacCracken, Director Office of
the US Global Change Research Program
Nature, August 24, 1995, Vol. 376, pp. 645-646
Note: Climate Change: The Evidence Mounts Up
by Michael MacCracken was published in Nature on
August 24, 1995 and summarized the presentations
of a six-day symposium held 3-8 July 1995 on
Climate Variability and Forcing Over the Past
Millennium at the XXI General Assembly of the
International Union of Geodesy and Geophysics in
Our present climate is unusually warm, and the
pattern of warming over the past century strongly
suggests an anthropogenic influence from
greenhouse gas and sulphate aerosols. That was
the message emerging from a week-long
symposium examining climate variability over the
past 1,000 years, which brought together results
from a growing array of observational techniques,
analyses of natural records and model results
("Climate Variability and Forcing Over the Past
Millennium", XXI General Assembly of the
International Union of Geodesy and Geophysics,
Boulder, Colorado, 3-8 July 1995).
Very precise measurement of the vertical profile of
air temperature in boreholes drilled up to a few
thousand metres deep indicate how the
near-surface ground temperature has changed over
the past few decades, over the past one or two
centuries, and since the early part of this
millennium (H. N. Pollack, Univ. Michigan). Papers
were presented on results from Europe, North
America, Africa, Asia, New Zealand and Australia;
virtually all measurements indicate that there was
an extended cool period a few centuries ago and
that ground temperatures during the present
century are on average about a degree warmer than
during the last century and, more importantly, than
earlier this millennium.
12/18/2009 2:21 PM
http: //www .usgcrp .gov/us gcrp/documents/mmnature .html
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MacCracken, Michael C. Climate Change: The Evidence Mounts Up, text, August 24, 1995; Pennsylvania Ave., Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc11972/m1/1/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .