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“Concentrations of the greenhouse gas carbon dioxide in the global atmosphere are surpassing 400 parts per million (ppm) for the first time in human history”—Scripps Institution of Oceanography


A year ago, I published an article on the then-most-recent warning from the Intergovernmental Panel on Climate Change (IPCC) on the rapidly increasing concentration of carbon dioxide (CO2) in out planet’s atmosphere. Concentrations were nearing 400 parts per million (ppm)…