When it comes to the ways global climate change impacts the world’s oceans things like melting ice caps and glaciers, and what’s called thermal expansion — that’s when water takes up more volume as its temperature goes up — are probably what first come to mind. Or how increased water temperatures impact sea life, like recent, widespread coral bleaching events off Florida’s coast and around the world. Or even how changes in temperature and salinity can alter ocean currents, which are crucial for regulating global climate and weather patterns. But, an overlooked aspect of this story is how increased levels of carbon dioxide in the atmosphere increases the acidity — or the pH level — of the world’s oceans.