Strange days are dawning in the global sea. Creatures are on the move. Dead zones are expanding. The foundation of life is slowly eroding. It's hard to imagine that humans could ever alter something as vast as the ocean, but that's exactly what we're doing. Over the past 200 years, we've poured more than two trillion metric tons of carbon dioxide into the atmosphere. As The Changing Sea vividly illustrates, that carbon dioxide isn't just changing the climate on land. It's transforming the ocean in ways that haven't been seen for millions of years. Scientists around the world are in a race to understand these changes and what they'll mean for thousands of species, including ours.