Rethinking plastics (IMAGE) University of Delaware Caption Billions of tons of plastics have been produced, but only a small fraction is ever reused. That must change, researchers say. Credit Graphic by Jeffrey C. Chase 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.