Costa Rica Tropical Forest (IMAGE) The University of Montana Caption Wet tropical forests, like this one on the Osa Peninsula in southwestern Costa Rica, are among the most productive ecosystems on earth, and new research points to the importance of both temperature and rainfall on future plant growth as the climate changes. Credit Courtesy of Cory Cleveland. 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.