Environmentalists have been trying to link reports about the beaching of a 35,000-strong walrus herd to global warming, which they say is melting the polar ice caps. "The massive concentration of walruses onshore-when they should be scattered broadly in ice-covered waters-is just one example of the impacts of climate change on the distribution of marine species in the Arctic," Margaret Williams, head of the World Wildlife Fund's Arctic program, said .
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