Forest Expansion (IMAGE) Ecological Society of America Caption Many tree species are expanding their range westward due to climate change, a shift caused by changes in precipitation and observed among species sharing similar traits. Photo courtesy of Songlin Fei. Credit Songlin Fei. Usage Restrictions Photo courtesy of Songlin Fei. 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.