Tree Core (IMAGE) University of Washington Caption Michael Case, a University of Washington graduate student in forest resources, collects a core to check tree growth that, depending on where a forest is located, can increase or decrease with a warming climate. Credit Jeremy Littell/University of Washington Usage Restrictions Photo credit required 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.