The findings, in brief. (IMAGE) University of Copenhagen - Faculty of Science Caption D-O events have been difficult to understand. Vettoreti et al. show the quick, abrupt warmings might have been controlled by a "CO2-window". Credit TiPES/HP Usage Restrictions None. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.