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Asserts that rich archives of the Earth's climate have been kept in cold storage for more than 200,000 years in the ice sheets of Greenland and Antarctica. Results of two recently drilled deep ice cores; Detection of climate shifts over periods as short as a few years; Additional information.

Comments on a study by Richard Alley and co-workers published in the April 8, 1993 issue of `Nature' reporting ice-core evidence of a different, but equally profound nature to the record of atmospheric CO2 concentration spanning the past 200,000 years. Earlier claims that the Earth's climate system has several stable modes, between which it flips; Greenland Ice Sheet Project II (GISP2); GISP2 ice-core ages; More.