The Pool is Diminishing (IMAGE) University of Southern California Caption Better utilization, trading and other strategies can recover twice or four times current utilization. But requests for address double every year, so trading will only help for two years. Credit USC Information Sciences Institute Usage Restrictions must credit USC Information Sciences Institute 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.