Ever-higher seas, though, still require more ambitious planning. The necessary item will be raising building entrances or building up the land. Massive sea gates could block storm surges (大浪）from entering upper New York harbor. Other choices for protecting the city include building barrier islands and extending the shore where feasible, which will make a huge figure on our budget.

　　79. __________

　　But in some ways New York’s challenge is relatively simple. Unlike many other areas of the country that will have to adapt to the varied and unpredictable effects of climate change, the city can have confidence that it faces a well-defined danger 一 rising seas — with effects that are possible to tell. It's obvious that spending billions to protect this population center is a worthwhile investment. And, unlike other places, local officials have already started thinking seriously about engineering their way out of danger.

　　80. __________

　　In the coming decades, areas up and down the Atlantic coast will have to argue about which coastal areas are worth protecting — by raising land, lengthening beaches, heightening homes or building sea walls to keep the water out ——and which aren't. Sea walls won't make sense everywhere; they are expensive. Now, the first thing federal and local officials can do is to plan ahead to decide which lands will inevitably be given up to the ocean and which will be guarded with every effort within our ability.

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