(IMAGE) Kumamoto University Caption Anthropogenic, trans-border lead pollution is discovered in Japanese lake sediment cores and tracked to its source in research from Associate Professor Takahiro Hosono of Kumamoto University, Japan. Credit Associate Professor Takahiro Hosono Usage Restrictions This image may only be used in conjunction with the accompanying release, or stories written about the work described in the release with reference to the original work. Reprinted from <i>Sci. Total Environ.</i>, vol. 559, T. Hosono, K. Alvarez, and M. Kuwae, “Lead isotope ratios in six lake sediment cores from Japan Archipelago: Historical record of trans-boundary pollution sources,” pp. 24-37, 2016, Copyright 2016, with permission from Elsevier. (DOI: 10.1016/j.scitotenv.2016.03.138) 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.