Unexpected Greenhouse Gas Effect in Lakes (IMAGE) University of Basel Caption Effects of climate change on the water temperature, water transparency, density stratification and oxygen content in lakes. In contrast to clear lakes, nutrient-rich and thus more turbid lakes develop a "thermal shield" that can cause the deeper part of the lake to cool down. Credit University of Basel Usage Restrictions Please use with proper credit. 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.