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Activity 2.1: The Issue https://serc.carleton.edu/integrate/teaching_materials/geosci_methods/activity_2.1.html
Provenance Dr. Xin Lan, NOAA/GML (gml.noaa.gov/ccgg/trends/) and Dr. Ralph Keeling, Scripps Institution of Oceanography (scrippsco2.ucsd.edu/).
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