Ice-core evidence of abrupt climate changes.
Ice-core records show that climate changes in the past have been large, rapid, and synchronous over broad areas extending into low latitudes, with less variability over historical times. These ice-core records come from high mountain glaciers and the polar regions, including small ice caps and the large ice sheets of Greenland and Antarctica.
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Environment Institute and Department of Geosciences, Pennsylvania State University, Deike Building, University Park, PA 16802, USA.