UNCG (IMAGE) University of North Carolina at Greensboro Caption A UNCG Biology student examines a species of grass at the UNCG Plant and Pollinator Center. Grassy ecosystems make up 40 percent of the Earth’s land surface. Credit UNCG Usage Restrictions None 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.