The ocean is under assault as people demand more of its resources. Now climate change is causing the greatest stress yet to ocean ecosystems. Kenneth Cukier talks to Jane Lubchenco, the first US science envoy for the ocean, about why the ocean is too big to ignore. He meets the scientists helping corals to spawn outside their natural habitat and using seaweed as a substitute for single-use plastic. Also, how can Japanese sushi chefs guarantee the origins of their fish?

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