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Workers with the Billion Oyster Project place shells in the waters near Brooklyn in 2018. The nonprofit aims to rebuild New York Harbor’s oyster population as a means of improving both water quality and flood resilience. 

Workers with the Billion Oyster Project place shells in the waters near Brooklyn in 2018. The nonprofit aims to rebuild New York Harbor’s oyster population as a means of improving both water quality and flood resilience. 

Photographer: Don Emmert/AFP via Getty Images

New York City Is Building a Wall of Oysters to Fend Off Floods

Thousands of acres of undersea reefs once protected the city’s shoreline. Now an army of volunteers is bringing the bivalves back, one shell at a time. 

A row of plastic bins sits in a gravel lot next to Brooklyn’s Domino Park promenade; each holds small pieces of New York City’s more climate-proof future. 

They’re full of oyster shells, leftovers collected from the plates of patrons at more than 45 New York restaurants. Every week, a truck drops the shells at a Greenpoint processing site. (Any ordinary oyster-eater can drop off shells, too.) Then the discards — 1.8 million pounds of them to date — are cleaned, cured in the sun and “set” with microscopic larvae. Redeployed in bags all around the city’s waters, the recycled shells serve as a home for baby oysters to grow on, ultimately building a reef that can soften the blow of big waves, ease erosion, and help prevent coastal flooding from rising seas.