Project aims to track big city carbon footprints

Associated Press
Project aims to track big city carbon footprints

Riley Duren, the chief systems engineer for the Earth Science and Technology Directorate at NASA’s Jet Propulsion Laboratory(JPL) demonstrates on the laser radar designed to measure carbon dioxide in the air at Caltech's Linde + Robinson Laboratory in Pasadena, Calif., Friday, April 12, 2013. A mile above this city, sensors gaze down on the basin from atop Mount Wilson the way a satellite fixates on Earth, collecting pieces of information about Los Angeles' carbon footprint. (AP Photo/Jae C. Hong)

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