In a paper published in the journal Climate of the Past, the researchers use Antarctic and Greenland ice cores to examine the time lag between changes in temperature and in atmospheric carbon dioxide levels in the past. Their findings suggest that feedbacks in the climate system – in which warming is linked to natural carbon dioxide increase, driving further warming – may operate faster than previously thought. Eric Steig, ESS professor and director of the Quaternary Research Center, is quoted; read more here.