CO2 levels hit ‘troubling milestone’

CO2 levels hit ‘troubling milestone’

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Chris Carparelli adjusts a glass flask in an air sample processing room at NOAA’s Earth System Research Laboratory in Boulder. Researchers at the lab measure the levels of carbon dioxide and other greenhouse gases in air sent in weekly from sites that are part of an international cooperative air sampling network.
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On the Net

NOAA’s global monitoring lab: http://esrl.noaa.gov/gmd

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