In February of this month… reading averaged around 403 ppm. They briefly hit 409 ppm earlier this month… and are now back down to a little less than 405 ppm. This huge 2 month jump is likely cyclical in nature… there is often a rather big uptick in CO2 through the winter and early in April… then concentrations will often peak in later in April or in May. Carbon dioxide emission then decrease late spring and summer as photosynthesis and plant growth take it in. Later in the fall and winter into early spring values then cyclically rise again.
Here is a look at this phenomenon… showing CO2 values over the past year at the Mauna Loa Observatory.
For more on current CO2 levels… visit https://scripps.ucsd.edu/programs/keelingcurve/
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