A 5-mile system of gates and causeways built from Sandy Hook, N.J., to Queens, N.Y., is proposed as one option to protect New York City from expected storm surges due to climate change and rising sea levels. Portable flood walls are another possibility, with the cost for any solution expected to total billions of dollars. But "when you compare the cost of the flood-wall system to the costs of remediation after a storm, or the costs of other storm protection alternatives, it no longer seems like such a large investment," said Alan Blumberg, professor of ocean engineering at Stevens Institute of Technology in Hoboken, N.J.

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