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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.

Dansgaard et al., chapter 3 of Karl K. Turekian, ed., The Late Cenozoic Glacial Ages,
copyright © Yale University Press, 1971.

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.