Pollard Video (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 David Pollard, senior research scientist in Penn States Earth and Environmental Systems Institute describes his research on Antarctic ice-sheet melting. Credit 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.