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Humanity's use of fossil fuels sends 35 billion metric tons of carbon dioxide into the atmosphere every year. That has already begun to change the fundamental chemistry of the world's oceans, steadily making them more acidic. Now, a new high resolution computer model reveals that over the next 4 decades, rising ocean acidity will likely have profound impacts on waters off the West Coast of the United States, home to one of the world's most diverse marine ecosystems and most important commercial fisheries. These impacts have the potential to upend the entire marine ecosystem and affect millions of people dependent upon it for food and jobs.