Forest Photography (image) Brown University Caption Time-series digital photos are a great help in tracking how forests change over time. But new research suggests photos may not be a good measure of peak season photosynthesis. The peak greenness of photos taken of a New England forest occurred 20 days before peak chlorophyll levels. Credit Marc Mayes/Brown University Usage Restrictions None 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.