Reaching for the sky (IMAGE) Columbia Climate School Caption Center, a Douglas fir in the Tahoma Creek vicinity of Washington’s Mt. Rainier National Park, from which the authors took a core sample. Credit Grant Harley/University of Idaho Usage Restrictions Credit must be given. License Original 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.