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(Jefferson Co. Airport, Colo., May 20, 2004) Heather Graven, a Scripps Institution of Oceanography employee, collects flasks of air Thursday morning for later measurement of Carbon 14 as she flys in a National Center for Atmospheric Research C-130 research aircraft over the Colorado mountains to measure how much carbon dioxide mountain forests remove from the air. (Photo by HAL STOELZLE/ROCKY MOUNTAIN NEWS)

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