Shorter, younger forests (VIDEO) DOE/Pacific Northwest National Laboratory This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Researchers led by the U.S. Department of Energy's Pacific Northwest National Laboratory have found that rising temperatures and carbon dioxide have been altering the world's forests through increased stress and carbon dioxide and other factors. The Earth has witnessed a dramatic decrease in the age and stature of forests. Credit Graham Bourque/PNNL Usage Restrictions Please use credit info. 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.