Everyone seems to think that carbon dioxide goes into the atmosphere and sort of sits there like some invisible smoke, trapping outgoing IR like our automobile windshields and heating us up. Carbon dioxide is more like a freight train. Humans currently pump nearly 10 gigatons, the weight of 10 cubic kilometers of distilled water, of CO2 into the atmosphere each year. That sound like a lot right? It is a lot.
But the Oceans cycle 90gt of biological and mineral CO2 with the atmosphere and mostly biological processes on land 120gt more each year. So for all our might, we are contributing less than 5% to a natural cycle that has existed since plants colonized land nearly 400 million years ago.
Carbon dioxide has an almost magical affinity for water. Leave distilled water out and it will equalize with ambient CO2 in hours. This may have something to do with Carbon being the element of life. But it surely has something to do with the freight train of Carbon cycling between the earth’s surface and the atmosphere each year.
geosciencebigpicture 
Do you know how much is contained by land plants and trees? And if you compared carbon being put into the air from deforestation vs. the effects of Ocean pollution which one has more of an impact?
Nobody knows these things with great precision but plant biomass is thought to contain about 550gt sequestered carbon. Slashing and burning definitely releases CO2 but it is important to remember that most of plant biomass is not involved in photosynthesis. Replacing the canopy with grassland or crops may cause net loss of photosynthetic activity short term, but Carbon is a precious commodity for life. Nearby forest will increase its growth from the extra CO2. We routinely pump 2000ppm CO2 (5x current atmospheric) into greehouses. See “Carbon Isotope Excursions and Carbon Limitation of Primary Productivity in the Biosphere”.
Ocean pollution includes a big spectrum of chemicals. Much of the ocean surface is a nutrient desert.Some of our pollution (including CO2) actually increases planktonic photosynthesis. I am more worried about Sulfur…
http://www.google.com/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Carbon_cycle.jpg/460px-Carbon_cycle.jpg&imgrefurl=http://en.wikipedia.org/wiki/Carbon_cycle&h=307&w=460&sz=47&tbnid=qE7escfln7kvoM:&tbnh=90&tbnw=135&zoom=1&usg=__HEfjRywHGR7Ny7Kw2YT5zNGs4fM=&docid=mbV_P2BRDEqLkM&hl=en&sa=X&ei=mTgmUd70IcTW2gWTmoHYCw&sqi=2&ved=0CEIQ9QEwAg&dur=174