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Examines the phase evolution of precession and semiprecession cycles in the tropical and extra-tropical Atlantic Ocean. Purpose of the study to explain changes in the Earth's glacial cycles during the Pleistocene epoch; Conclusion that heat flow across the equator to higher latitudes strengthened the semiprecession cycle in the Northern Hemisphere and triggered the transition to sustained glacial cycles.

Reveals that the climate in Greenland during the last interglacial period was characterized by a series of severe cold periods lasting from decades to centuries. Isotope and chemical analyses of the Greenland Ice-Core Project from Summit, Greenland; Effects of future global warming.

Reveals a record of Earth's climate over the eight past ice ages and their associated interglacial periods from an ice core in Antarctica. Evidence for the past climatic instability of the last glacial cycle; Dome C record; Shift in the pattern of glacial cycles that occurred without changes in the varying seasonal distribution of sunlight that is believed to pace the ice ages.

Both Mars and Earth have experienced ice ages in geologically recent times. Coincidence of the phenomenon on two planets will further the scientific quest to answer the question of how ice ages originate. [ABSTRACT FROM AUTHOR]