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 4, NUMBER 11, NOVEMBER 1991
Declining Amphibian Populations worldwide were the subject of a
workshop sponsored by the National Research Council (Irvine, Calif., Feb. 1990),
reported by D.B. Wake on p. 860 of Science, Aug. 23, 1991. Although
increased levels of ultraviolet radiation and global climate change are among a
host of possible factors involved, little is known about the declines.
"Seabed Molecule Mirrors Climate Change," J. Johnson, New
Scientist, p. 22, Oct. 12, 1991. Changes in the bonding of a single molecule
in marine sediments mirror closely changes in the surface temperature of the
sea. This suggests a powerful way to trace past changes in climate.
"U.S. Adopts Global Climate Change Data Information Policy,"
Global Environ. Change Rep., p. 4, Oct. 18, 1991. The Committee on Earth
and Environmental Sciences has endorsed seven principles on data management for
the 18 agencies it represents. They include open sharing of data and providing
assistance for those outside the government who wish to use data--points that
respond to recent objections from some scientists.
"Atmospheric CO Estimates May Be Low," Eos, p. 338, Aug.
6, 1991. Comparison of world reference standards for making CO measurements
shows that some previous measurements are in error. (See Novelli et al., Prof.
Pubs./Of General Interest, this Global Climate Change Digest issue--Nov.
"National Workshop on Gas Hydrates," M.D. Max et al., Eos,
pp. 476-477, Oct. 29, 1991. Much of the discussion at the April 1991 conference
in Reston, Virginia, centered around the immense amount of methane stored as
hydrates in deep ocean sediments and underground. This could form an important
source of methane in the atmosphere if any were to be released by global warming
or other mechanisms.
"Hydroxyl, the Cleanser That Thrives on Dirt," R.A. Kerr, Science,
pp. 1210-1211, Sep. 13, 1991. During their brief lifetimes of about a second,
hydroxyl radicals oxidize and eliminate from the atmosphere a number of
pollutants. However, some scientists suspect hydroxyl is less abundant now than
before the industrial era began; recent computer modeling suggests that since
the year 1700 hydroxyl has decreased by as much as 20 percent. Reduction of
nitrogen oxide emissions could tend to reduce hydroxyl levels, as would
increasing ultraviolet radiation.
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