Collection Cylinders (image) University of California - San Diego Caption Different generations of collection cylinders used to collect air samples from locations around the world over the past 30 years. Scripps Institution of Oceanography at UC San Diego geochemistry researchers Ray Weiss and Jens Muehle led a study that found that the greenhouse gas nitrogen trifluoride, used in the manufacture of flat-panel monitors, escapes to the atmosphere at levels much higher than previously assumed. Credit Scripps Institution of Oceanography, UC San Diego Usage Restrictions None 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.