Scientific American

One year ago, on October 29, superstorm Sandy swamped New York City and New Jersey. Although authorities did a terrific job of evacuating people, they were helpless against Sandy's record-high storm surge. Today the city and its neighboring state are still trying to recover, and the struggles raise a stark lesson that coastal communities all along the U.S. East Coast and Gulf Coast must take to heart: spending money, even lots of money, to protect against storms is far cheaper than fixing damage and rebuilding afterward.

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