Whether or not you legitimate claims of human-made climate change, there is another carbon problem--ocean acidification.
The ocean is praised as a carbon sink, or place that carbon can go instead of the atmosphere. But as we continue to pollute and the ocean continues to absorb carbon, the ocean becomes more acidic. The acidity is starting to dissolve seashells. This has major effects on underwater ecosystems, and people who depend on them.
At this rate, we will profoundly alter the ocean's chemistry, and who knows what sea life will adapt.