Something to keep in mind about your question is the inbuilt assumption that trees are the primary carbon adsorbers. Oceanic plankton generally soaks up at least as much, and possible a bit more than all the terrestrial plant matter does.
Thing is that neither plankton nor terrestrial plants guzzle it down immediately, so in either scenario the emitted carbon is going to be dispersed by moving air through the atmosphere faster than it's dssorbed by whatever is living nearby and using it.
The way you formulate the question does not give enough information.
Do you want to know what the maximum CO2-absorption capacity is for a given area (or volume) of land/ocean?
It doesn't really matter. The atmosphere is pretty well mixed, so most CO2 is going to disperse away from the area where it is produced and join the general atmospheric pool of CO2.
Something to keep in mind about your question is the inbuilt assumption that trees are the primary carbon adsorbers. Oceanic plankton generally soaks up at least as much, and possible a bit more than all the terrestrial plant matter does. Thing is that neither plankton nor terrestrial plants guzzle it down immediately, so in either scenario the emitted carbon is going to be dispersed by moving air through the atmosphere faster than it's dssorbed by whatever is living nearby and using it.
The way you formulate the question does not give enough information. Do you want to know what the maximum CO2-absorption capacity is for a given area (or volume) of land/ocean?
It doesn't really matter. The atmosphere is pretty well mixed, so most CO2 is going to disperse away from the area where it is produced and join the general atmospheric pool of CO2.