Plants consume CO2 and give off O2. Animals consume O2 and give off CO2.
The real question is how much CO2 is created in the production of carbonated soft drinks and why haven't the Enviro Wackos marched on the headquarters of Coca Cola and Pepsi corps?
OOPS ... you're right ... and I should have and actually did know better. I guess I should have had that first cup of coffee before posting.