Photo 4 (IMAGE) Desert Research Institute Caption Photo 4 shows study coauthor Nathan Chellman preparing the ice core sample for analysis at DRI’s Ice Core Lab. Credit Credit: Jessi LeMay/DRI Usage Restrictions Use with credit 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.