Methane Observation Tower (image) Harvard University Share Print E-Mail 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 Share Print E-Mail 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.