To expand on this: the molar weight of dry air is ~28g/mol, while CO2 is ~44g/mol. So each increase in atmospheric CO2 by 1ppm corresponds to about 8.6GT of un

To expand on this: the molar weight of dry air is ~28g/mol, while CO2 is ~44g/mol. So each increase in atmospheric CO2 by 1ppm corresponds to about 8.6GT of unabsorbed CO2. The Keeling Curve shows an increase of 1.86PPM from May 2021 to May 2022, meaning that the amount of CO2 emitted from all sources was greater than the amount absorbed by 15.7GT. So of the 29GT emitted by humans, 13.3 was reabsorbed. Obviously this is not the whole story. The Keeling Curve shows that worldwide CO2 levels were already rising in the 50s and early 60s, when total emissions were below the 13.3 our biosphere is absorbing annually. But this is sufficient to show that a (substantial) reduction in human emissions would reverse the currently increasing global CO2 levels, and the greenhouse warming that comes with it.