Human Inputs (IMAGE) Cary Institute of Ecosystem Studies Caption These are human inputs that alter salt ions in freshwaters. Credit Leslie Tumblety/Cary Institute of Ecosystem Studies Usage Restrictions To promote this press release. 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.