Project aims to track big city carbon footprints

By alicia-chang

Published May 12, 2013 4:00am ET

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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), shows the global map of carbon dioxide at Mount Wilson, 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) | Jae C. Hong

LOS ANGELES (AP) — Every time Los Angeles exhales, odd-looking gadgets anchored in the mountains above the city trace the invisible puffs of carbon dioxide, methane and other greenhouse gases that waft skyward.

Halfway around the globe, similar contraptions atop the Eiffel Tower and elsewhere around Paris keep a pulse on emissions from smokestacks and automobile tailpipes. And there is talk of outfitting Sao Paulo, Brazil, with sensors that sniff the byproducts of burning fossil fuels.

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Climate Change Department of Energy Energy and Environment