The ASU Sustainable Phosphorus Initiative (IMAGE) Arizona State University Caption The ASU Sustainable Phosphorus Initiative examines phosphorus, food and our future on Earth Day, April 22. Credit ASU 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.