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|The Discovery of Global Warming May 2003|
Variations of oxygen isotopes in the Camp Century ice core (with
changes from a smoothed curve set off in black), going back 14,000 years.
Higher temperatures to right. (Difference of isotopes
in parts per thousand graphed against years Before Present.)
Below: In the ice trench.
Viewing a section of core, 1964. Compare the picture here of the 1989-92 GISP trench.
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Photo by David Atwood, U.S. Army-ERDC-CRREL
(Cold Regions Research and Engineering Laboratory), courtesy Herb Ueda.