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Wikipedia ice cores

American Geophysical Union Ice cores drilled at Vostok Station.

note that app 13k years ago its was the coldest and from then there is a rapid rise in temperature and a leveling off that coincides with the period of time of mans civilization. 

Graph of CO2 (Green graph), temperature (Blue graph), and dust concentration (Red graph) measured from the Vostok, Antarctica ice core as reported by Petit et al., 1999. Higher dust levels are believed to be caused by cold, dry periods.( from Wikipedia)