It is easier to significantly alter the earth's CO2 balance than its O2 balance because
A) CO2 is a trace molecule in the atmosphere whereas O2 is not.
B) it is so much easier to produce CO2.
C) CO2 is a highly reactive molecule whereas O2 is inert.
D) CO2 is an inert molecule whereas O2 is highly reactive.
E) CO2 is a very unstable molecule whereas O2 is stable.
A
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