February 28, 2007
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FROM VOLUME 4, NUMBER 7, JULY 1991
The Carbon Cycle (Each discusses papers listed in Prof.
Publications/Global Carbon Cycle, this Global Climate Change Digest issue--July
"Tiny Plants Challenge Greenhouse Plan," Sci. News, p.
327, May 25, 1991. Antarctic sediment cores indicate that diatoms fared poorly
in glacial periods, suggesting ocean fertilization to avert greenhouse warming
would not work. (See Mortlock, Nature, p. 220, May 16.)
"CO2: Where It Goes, Nobody Knows," Sci. News, p. 191,
Mar. 23, 1991. Sampled variations in CO2 concentrations at the ocean surface
indicate a possible source of major error in estimates of ocean absorption of
CO2. (See Watson, Nature, p. 50, Mar. 7.)
"CO2 and Temperature: A Pas de Deux," Sci. News,
p. 159, Mar. 9, 1991. Close correlation observed between air temperature and
atmospheric CO2 levels supports the possibility of positive feedback from
greenhouse warming. (See Marston, Nature, p. 573, Feb. 14.)
"The Buildup of a Greenhouse Gas Slows," Science, p.
1496, June 14, 1991. At the spring American Geophysical Union meeting,
atmospheric chemists Sherwood Rowland and Donald Blake announced that the rate
of methane increase has slowed from 18 to about 13 ppbv per year. Although the
reason for this is not known, Rowland pointed out that methane is a good
candidate for control because of its short atmospheric lifetime.
"Rice: Methane Risk Rises," Sci. News, p. 310, May 18,
1991. New measurements show that methane emissions from Chinese rice paddies are
4 to 10 times those from U.S. paddies. (See Khalil, Environ. Sci. Technol.,
p. 979, May 1991, listed in Prof. Pubs./Atmos. Chem., this Global Climate
Change Digest issue--July 1991.)
"U.S. Skies Harbor Ozone Destroyer," R. Monastersky, Sci.
News, p. 84, Mar. 28, 1991 (see also New Sci., p. 20, Mar. 16).
Unexpectedly large concentrations of chlorine monoxide have been measured, the
first direct evidence at midlatitudes that chlorine compounds can destroy ozone
in wintertime. (See Toohey, Geophys. Res. Lett., p. 21, Jan.
1991, listed in Prof. Pubs./Stratospheric Ozone, this Global Climate Change
Digest issue--July 1991.)
"Ecologists Set Broad Priorities for the 1990s," A. Gibbons,
Science, p. 504, Apr. 26, 1991. A research agenda just completed by the
Ecological Society of America makes global change a top priority, along with
biological diversity and sustainability of ecological systems. (See Prof.
Pubs./General Interest, this Global Climate Change Digest issue--July
"EOS Panel Begins Review," Eos, p. 273, June 25, 1991. A
panel of scientists and engineers created at the request of the Bush
Administration has begun to review NASA's Earth Observing System plans.
Arguments that favor using smaller satellites at less cost are likely to be
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