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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.
"This was a Herculean task that no one else has ever attempted.And then there is climate change and ocean acidification which threaten to flood nesting sites and disrupt food sources.Seabirds are about twice as likely as land-based birds to be threatened with extinction.While the results necessarily remain uncertain, they undoubtedly represent our most complete picture yet of the global state of fish catches." Worm said the world's fisheries were being over-exploited but that some stocks were being sustainably managed: "Where such measures have been taken, we find that both fish and fishermen are more likely to persist into the future." Global fish catches rose from the 1950s to 1996 as fishing fleets expanded and discovered new fish stocks to exploit.But after 1996, few undiscovered fisheries were left and catches started to decline.