mediterranean sea

As we have already seen, climate change has been behind the mass die-offs of anthozoans that have occurred in recent years in the Mediterranean Sea. But aside from diseases and bleaching, higher water temperatures have other pernicious effects on anthozoans. Due to the release of carbon dioxide emissions into the atmosphere, it is predicted that the oceans will increase their absorption of CO2 , thereby provoking changes in the chemical composition of the water. A larger quantity of CO2 leads to a lower pH of water, increasing the acidity of the oceans and reducing the availability of carbonate ions. The consequence of this is a reduced calcification rate204, which will affect many marine organisms that need calcite or aragonite to form their skeletons, like corals. If we take into account that calculations forecasting conditions over this millennium say that the oceans will absorb 90% of anthropogenic CO2 205,we can understand the changes this will have on the marine ecosystem. Studies indicate decreases in calcification around 40% over the next 50 years, and can even decrease as much as 80% before the end of the century. 

whach the video in the link below ( 0:00-1:30 is enough)