Is a nation still a nation if it sinks under the sea?

The World

Climate change poses an existential threat to Tuvalu, a small island nation in the Pacific. By the end of the century, scientists say it could sink under the rising seas. That's why Tuvalu's leaders are trying to figure out how to save the country, even if its physical territory disappears. The World's Sarah Birnbaum reports from Sydney.

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