[propbeanie]

Nah, the trees absorb the CO2, do photosynthesis, and give off oxygen as a byproduct of that process... Trees, grass, or most anything else green (except money) are beneficial like that... I don't remember about the ocean, but the fishies and other sea animals are like us, and consumers of oxygen & expellers of CO2... but the ocean (it is made of H2O though) also has green (and other colored) stuff growing in it that gives off oxygen too...