Andrew Larson, University of Montana (IMAGE) University of Washington Caption University of Montana's Andrew Larson surveys a portion of a plot in Yosemite National Park where scientists and volunteers tallied above-ground biomass including live trees, snags and downed woody debris. Credit J Lutz/U of Washington Usage Restrictions 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.