February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 8, NUMBER 7, JULY 1995
OF GENERAL INTEREST: TEMPERATURE TRENDS
"Climatic Warming in North America: Analysis of Borehole
Temperatures," D. Deming, Science, 268(5217), 1576-1577,
June 16, 1995.
Gives a synopsis of evidence of climate change based on examination of the
profile of temperature versus depth in holes bored in the Earth. The sum of
evidence from this technique, combined with the conventional instrumental record
of surface air temperatures, is consistent with a major climatic warming over
the North American continent since the middle of the 19th century. However, the
magnitude of the warming is within the range of natural variability, and a cause
and effect relationship to anthropogenic activities cannot be demonstrated
unambiguously at this time.
"Tree Ring Width and Density Evidence of Climatic and Potential
Forest Change in Alaska," G.C. Jacoby (Lamont-Doherty Earth Observ., Rte.
9W, Palisades NY 10964), R.D. D'Arrigo, Global Biogeochem. Cycles, 9(2),
227-234, June 1995.
Analysis of core samples from trees shows that the climatic warming observed
over much of Alaska during the past century is not producing ever-increasing
tree growth. Instead, warmer temperatures may be slowing tree growth by
promoting moisture loss and attacks by insects and diseases. (See summary and
discussion in Science, p. 1595, Mar. 17, 1995.)
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Index of Abbreviations