When it comes to climate change, almost all the attention is on the air. What is happening to the water, however, is just as worrying — although, for the moment, it may be slightly more manageable.
Here is the problem in a seashell: As the oceans absorb about a quarter of the carbon dioxide released by fossil-fuel burning, the pH level in the underwater world is falling, creating the marine version of climate change. Ocean acidification is rising at its fastest pace in 300 million years, scientists say.