Daily News: Mayor de Blasio proposed extending the South Street Seaport area by two city blocks into the East River — part of a $10 billion effort to fend off rising sea levels as a result of climate change.

“We had to find something that would work, no matter how expensive or ambitious it was,” de Blasio said Thursday at a press conference downtown.

The plan, part of a resilience study released Thursday, calls for extending the shoreline by a maximum of 500 feet, or two city blocks. The new segment of the shoreline, which would be 20 feet or above current sea levels, would serve as a flood barrier during storms — but it could also be home to buildings, including potential private development, de Blasio acknowledged.

But it will be necessary to keep lower Manhattan from being underwater, he argued — saying the city’s study had found that by 2100, 20% of the streets in area would experience daily tidal flooding, even in sunny weather. “This is the existential threat. This is the core issue we all must face as aggressively as humanly possible,” de Blasio said. Read More>>