From the “fun with conjecture department”, another graduate school paper parroting the claim from NOAA’s Susan Solomon that excess man-made CO2 stays in the atmosphere for thousands of years.
From CO2science: In a paper recently published in the international peer-reviewed journal Energy & Fuels, Dr. Robert H. Essenhigh (2009), Professor of Energy Conversion at The Ohio State University, addresses the residence time (RT) of anthropogenic CO2 in the air. He finds that the RT for bulk atmospheric CO2, the molecule CO2, is ~5 years, in good agreement with other cited sources (Segalstad, 1998), while the RT for the trace molecule CO2 is ~16 years. Both of these residence times are much shorter than what is claimed by the IPCC.
It seems to me that Gaia does a fine job of respirating CO2. It doesn’t just “sit there”, as you can see the process is quite dynamic:
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