More than 5,000 children, teachers and volunteers form a massive shark and shield on a beach in Malibu, Los Angeles, to say Defend the Sea from plasticPicture: REUTERS/Lou Dematteis/Spectral Q

More than 5,000 children, teachers and volunteers form a massive shark and shield on a beach in Malibu, Los Angeles, to say Defend the Sea from plasticPicture: REUTERS/Lou Dematteis/Spectral Q

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