February 28, 2007
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FROM VOLUME 7, NUMBER 1, JANUARY 1994
from a Greenland ice core (GRIP), reported last summer by
European scientists, indicated that the interval between the last
two ice ages had large, sudden temperature swings, suggesting
that our present interglacial climate could be subject to abrupt
shifts, especially as greenhouse gases rise. (See GCCD,
Sep 1993) Now analysis of a second ice core (GISP2), drilled near
the European one by U.S. scientists, throws the first conclusion
into question. (See Nature papers in Prof. Pubs./Gen. Int.
Sci., this issue.)
The two cores agree well during the interval from the present
to the start of the last ice age, but give conflicting results
prior to that time, possibly because of the effects of rough
terrain on the base of the ice sheet. Various interpretations of
this result by scientists are discussed in Science News,
p. 390, Dec. 11; Science, pp. 1818-1819, Dec. 17; Chem.
Eng. News, p. 7, Dec. 20; New Scientist, p. 14, Jan.
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