Lake ice degrading from warmer winters (VIDEO) York University This video is under embargo. Please login to access this video. Caption As winters in the Northern Hemisphere warm, researchers at York University in Toronto, Canada found that lake ice quality is degrading, and the denser, strong black ice is thinning, making the ice unstable and often unsafe for skaters, snowmobilers and ice truckers. Credit York University Usage Restrictions none License Original 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.