Dr. Trisha Spanbauer (IMAGE) University of Toledo Caption Dr. Trisha Spanbauer is an assistant professor in the Department of Environmental Sciences. She analyzed sediment cores taken from lakes across North America in a research article she co-authored in The Proceedings of the National Academy of Sciences, concluding that conclude that humans have had as much of an impact on the landscape as the retreat of the glaciers at the end of the Ice Age. Credit University of Toledo Usage Restrictions With attributions to the University of Toledo. 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.