Strange days are dawning in the global sea. Creatures are on the move. Dead zones are expanding. The foundation of life is slowly eroding. And we are the agents of that change. Over the past 200 years, human beings have poured more than two trillion metric tons of carbon dioxide into the atmosphere. And, 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. So is mass extinction the inevitable fate of the future sea? Are we willing to form a new partnership with the ocean and its astonishing creatures? If not, then our future and the future of thousands of other species may hang in the balance.

Narrated by David Suzuki. Episode 4.

Produced by the CBC and Merit Motion Pictures, in association with National Geographic Channels International. “One Ocean” series produced by Caroline Underwood.

Executive Producer, Merit Jensen Carr.