the ocean doesn't 'contribute carbon to the atmosphere', the atmosphere and the ocean exchange carbon. there's an equilibrium between the two. where do you think the ocean would be getting all of this carbon dioxide from? i once had a guy tell me that you shouldn't choose wind-generated electricity because 'wind doesn't blow at night, so you lose power'. think critically about things instead of just regurgitating garbage that supports your worldview.

by the way, carbon dioxide dissolved in water exists in equilibrium with carbonic acid, meaning that the more overall carbon dioxide there is the more carbonic acid there is as well. so while the ocean absorbs a lot of CO
2, it's also becoming more acidic.
volcanoes are pretty cool