FILE - In this Oct. 19, 2017 file photo, a boat crosses New York Harbor in front of the Manhattan skyline. Mayor Bill de Blasio is announcing a plan, Thursday, March 14, 2019, to protect lower Manhattan from rising sea levels by surrounding it with earthen berms and extending its shoreline by as much as 500 feet.
FILE - In this Oct. 19, 2017 file photo, a boat crosses New York Harbor in front of the Manhattan skyline. Mayor Bill de Blasio is announcing a plan, Thursday, March 14, 2019, to protect lower Manhattan from rising sea levels by surrounding it with earthen berms and extending its shoreline by as much as 500 feet. Mark Lennihan, File AP Photo
FILE - In this Oct. 19, 2017 file photo, a boat crosses New York Harbor in front of the Manhattan skyline. Mayor Bill de Blasio is announcing a plan, Thursday, March 14, 2019, to protect lower Manhattan from rising sea levels by surrounding it with earthen berms and extending its shoreline by as much as 500 feet. Mark Lennihan, File AP Photo