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Rising sea levels threaten to inundate low-lying roads in Louisiana, costing billions in port activity, The Post’s Juliet Eilperin reports. Northrop Grumman sees potential damage to billions in shoreline defense infrastructure, such as the imperiled drydock in Hampton Roads built to construct the next generation of aircraft carriers. Other factors are also at work in these examples of rapid coastline loss. But Louisiana and Virginia offer a picture of how further sea-level rise and higher storm surges — just one set of climate-related risks — could seriously disrupt human activity. . .