Source: American Geophysical Union Date: August 3, 2007 A 30,000-year Record Of Sea Surface Temperatures Off South Australia Science Daily — Continental glaciers originating at both poles reached their farthest extent about 20,000 years ago, marking a time known as the Last Glacial Maximum. Comparisons of ice cores from Greenland and Antarctica show that as these glaciers melted, warming occurred in asynchronous stages at the poles. While many northern hemisphere climate records match ice core records from Greenland, few southern hemisphere records exist to compare with ice core data from Antarctica. Calvo et al. analyze a marine core collected off...