In this article, Alfonso Mucci explains how oceans remove CO2 from the atmosphere, which affects aquatic ecosystems. This effect cleans the air, but pollutes bodies of water even more. Oceans come to be too acidic. Micro-organisms are at risk of becoming extinct, which in turn can deeply affect other species. The long-term repercussions are very hard to predict since gasified water descends to the bottom of the ocean very slowly. No one can know exactly what lies in the future for these ecosystems. An European scientist predicted over a century ago that this would happen.