Summary Graph (IMAGE) Desert Research Institute Caption Graphical summary of the study data showing the increase in heavy metal pollution found in five East Antarctic ice cores over time. The heatmap in the upper left corner depicts the simulated flow of heavy metal pollution from Potosi in South America throughout the Southern Hemisphere and to Antarctica. Ice core collection sites are shown as cyan circles. Credit DRI Usage Restrictions Use with credit to DRI 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.