For over four decades, scientists have been drilling deep into the massive glaciers on Greenland and Antarctica to extract samples of ice that reveal how climate changed in the past. The ice cores they have retrieved reach depths of up to 3,623 metres and also give clues as to what might lie ahead as the world warms. This interactive map shows the locations of the major ice-coring projects and gives the vital statistics for each site, such as drilling dates and oldest ice recovered. For a more detailed chronology of polar ice-core research since its beginnings in the 1950s, visit the timeline 'Earth's oldest ice' at Nature Reports Climate Change.
By: Anna Barnett