Ecology - Thinning forests (image) DOE/Oak Ridge National Laboratory Share Print E-Mail Caption Pine trees in the Tuolumne Valley of Yosemite National Park show the effects of drought and fire. Credit Anthony Walker/Oak Ridge National Laboratory, U.S. Dept. of Energy Usage Restrictions None Share Print E-Mail 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.