North American Glacier Retreats (IMAGE) University of Washington Caption The orange line shows the glacier length changes expected is there were no climate change. The purple bar marks the observed retreat of seven North American glaciers included in the study. Credit Gerard Roe/University of Washington Usage Restrictions With credit License Licensed 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.