Methane Observation Tower (image) Harvard University Caption This is a tower in Walnut Grove, California, where Lawrence Berkeley National Laboratory and NOAA's Earth System Research Laboratory conduct atmospheric measurements. Credit Photo courtesy of DOE and NOAA. 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.