Pollution Control Inspired by Nature (IMAGE) University of Copenhagen - Faculty of Science Caption Earth's atmosphere cleans itself no matter what is spewed into it. Matthew Johnson, Professor in atmospheric chemistry at the University of Copenhagen was inspired by the atmospheres self cleaning properties, when he invented the uniquely versatile GPAO (Gas Phase Advanced Oxidation) method of emissions control. Credit Mikal Schlosser/University of Copenhagen 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.