Lowland Tropical Forest in Panama (IMAGE) Smithsonian Tropical Research Institute Caption Even remote tropical forests, like this forest in Panama, are affected by nitrogen pollution. Credit Marcos Guerra, STRI Usage Restrictions Credit: STRI 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.