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J. Ewald, “Carbon Dioxide at NOAA’s Mauna Loa Observatory Reaches New Milestone: Tops 400 ppm,”
2013. http://icecap.us/index.php/go/joes-blog/in_defense_of_carbon_dioxide/
https://scripps.ucsd.edu/news/7992
https://scripps.ucsd.edu/news/7992

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