Contrails (VIDEO) Penn State This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption A team of Penn State researchers headed by Andrew Carleton, professor of geography, investigated the effects that contrails have on surface temperature and climate. Credit Curtis Parker, Penn State Usage Restrictions non commercial use 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.