Tilling (IMAGE) American Society of Agronomy Caption Aaron Mali (front) and Oulu Coquie (back) till biosolids into test plots, one of the first steps in transforming a blighted area into a functioning ecosystem. Credit Photo provided by Nick Basta. Usage Restrictions Please use with story only. 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.