<em>Phragmites</em> Marsh Boardwalk (IMAGE) Smithsonian Caption Invasive Phragmites reeds encroach on a boardwalk in a Maryland marsh. On this marsh, biologists with the Smithsonian Environmental Research Center have been running climate change experiments for more than 30 years. Credit Gary Peresta/Smithsonian Environmental Research Center Usage Restrictions This photo is available for noncommercial, educational use, provided proper attribution is given as cited in the photo credit, as per the Smithsonian Institution Terms of Use (https://www.si.edu/termsofuse) 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.