Evidence harvested from ocean sediments suggests that the North and South Poles have experienced regular periods of significant melting simultaneously.
A 600-meter core drilled from a site off Greenland’s eastern coast and a 200-m core from off Antarctica reveal several episodes of particularly high sediment accumulation in the past 3 million years, says Kristen E. St. John, a geologist at Appalachian State University in Boone, N.C.
Log in
Subscribers, enter your e-mail address for full access to the Science News archives and digital editions.