Lead-lined Clouds (IMAGE) DOE/Pacific Northwest National Laboratory Caption This ice crystal collected from a cloud at Switzerland's Jungfraujoch Research Station contains lead dispersed from human activities. Credit Cziczo et al DOI 10.1038/NGEO499 Usage Restrictions For news stories 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.