October 18, 2022
Why does the Keeling curve show an increase of roughly 3 parts per million (ppm) per year?
The causes of such a small annual increase in CO2, if true, are unknown and theoretical. There are several possible causes, but 3 ppm is an annual increase in CO2 of only 0.0003% of the total CO2 in the atmosphere, an amount so small it cannot be distinguished in open air from random measurement noise. Your exhaled breath is about 4% CO2, and higher if you are exercising. Systematic or random perturbations in sea surface temperature and/or humidity, under water volcanoes, cyclical deep ocean currents dense with CO2 rising to sea surface, and destruction of photosynthesizing plants and plankton, are among possible causes, and each of these has multiple possible causes.
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