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For about 50 yr, ice cores have provided a wealth of information about pastclimatic and environmental changes. Ice cores from Greenland, Antarctica andother glacier-covered regions now encompass a variety of time scales.However, the longer time scales (e.g. at least back to the Last Glacialperiod) are covered by deep ice cores, the number of which is still verylimited: seven from Greenland, with only one providing an undisturbed recordof a part of the last interglacial period, and a dozen from Antarctica, withthe longest record covering the last 800 000 yr. This article aims tosummarize this successful adventure initiated by a few pioneers and theirteams and to review key scientific results by focusing on climate (inparticular water isotopes) and climate-related (e.g. greenhouse gases)reconstructions. Future research is well taken into account by the fourprojects defined by IPICS. However, it remains a challenge to get an intactrecord of the Last Interglacial in Greenland and to extend the Antarcticrecord through the mid-Pleistocene transition, if possible back to 1.5 Ma

A brief history of ice core science over the last 50 yr