Terrestrial forests are well known for their capacity to absorb our carbon dioxide emissions (CO2), however, the similar role that plays the Ocean has been overlooked. The Ocean covers two thirds of the planet’s surface and absorbs more than one fourth of our world CO2 emissions, representing up to 34 billion tons per year. Hence, the Ocean constitutes an incredible natural carbon sink. This is the result of two phenomenon. On one hand, there is a physico-chemical dissolution process of atmospheric CO2 when it interacts contact with seawater. And on the other hand, the presence of marine and coastal micro-organisms and ecosystems is decisive, when it comes to carbon dioxide absorption and storage.