A new report published in Nature delineates the threat from ocean acidification described here. I've posted about the threat to Maine, and here and here about the Pacific Northwest where I live. As I described
We have an historical event showing us what happens when the CO2 concentration accelerates, the PETM boundary, the Paleoeocene-Eocene Boundary, where 55.8 million years ago, the oceans and atmosphere were filled with greenhouse gases over a very short period of time.
The ocean acidification at that time caused the largest loss of sea life in the history of the planet. We are heading for something even worse.
The authors of the Nature article published a diagram showing the areas of concern for North American: