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Sunday, August 2, 2026
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Paul Krummel and Paul Fraser
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  • February carbon dioxide levels average 400ppm for first time

    February carbon dioxide levels average 400ppm for first time

    For the first time, the February monthly average carbon dioxide levels at the Mauna Loa Observatory have passed 400ppm.
    Paul Krummel and Paul Fraser
    Mar 9, 2015
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