Drought (IMAGE) National Science Foundation Caption Large tropical trees stand where they once grew during severe droughts in Ghana. Credit Photograph by J.T. Overpeck and W. Wheeler, University of Arizona. Usage Restrictions None 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.