NICE, France—More than 2,000 scientists, advocates and policymakers from at least 100 countries convened this week at the One Ocean Science Congress, warning of a mounting marine crisis and promising recommendations to solve it—not only for the sake of life below the surface, but for the entire planet.

“The ocean is suffering at the cause of humanity,” said the Mayor of Nice, Christian Estrosi, who spoke at the event’s opening ceremony Tuesday at Port Lympia. “Either we save our oceans or the entire race will pay.”

Rising sea temperatures due to global warming, ocean acidification, plastic pollution, and offshore oil and gas developments are just some of the threats plaguing the ocean and jeopardizing humans in the process. So are overfishing and other destructive fishing practices such

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