Chris Polashenski, Dartmouth College (IMAGE) Dartmouth College Caption Dartmouth Adjunct Assistant Professor Chris Polashenski and his colleagues found that degrading satellite sensors, not soot or dust, are responsible for the apparent decline in reflectivity of Arctic snow. Credit Chris Polashenski Usage Restrictions Credit Chris Polashenski 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.