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All of these activities need investment and support of governments around the world to make them happen," Lascelles said.
"This was a Herculean task that no one else has ever attempted.
A paper released last month found that 90% of the world's seabirds likely have plastic in their stomachs.
Seabirds continually mistake plastic for fish eggs, devouring large amounts.
Plastic in animals' stomachs not only release deadly toxins, but can also lead to slow starvation by obstructing the animals' bowels.
Birds even feed plastic bits to their young, killing their fledglings en masse.
The decline since 1996 has largely been in fish caught by industrial fleets and to a lesser extent a cut in the number of unwanted fish discarded at sea.