Forest Expansion (image) Ecological Society of America Share Print E-Mail 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. 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.