The Economist -
4 Jan 2017 20:00

IN 2015, a bit over two years after Hurricane Sandy hit his city, Bill de Blasio, New York's mayor, announced the creation of a $3 billion restoration fund. Part of the money is intended to pay for sea walls that will help protect the place from future storms. Building such walls may be an even more timely move than Mr de Blasio thought when he made his announcement. As a paper just published inNatureexplains, for the past two decades a natural form of protection may have been shielding America'...
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