In the Ebb and Flow Of Ancient Glaciers, Clues to Next Ice Age
LEAD: THE climatic history of the last half-million years is largely a history of ice and cold, punctuated every 100,000 years or so by brief, glorious intervals of unusual warmth called interglacials. If nature takes its course, scientists say, the current interglacial - the one in which human civilization developed - should begin to end within the next 2,000 years or sooner.
