Oysters at Zadie’s Oyster Room, one of the New York City restaurants participating in Billion Oyster Project’s shell-collection program.

Oysters at Zadie's Oyster Room, one of the New York City restaurants participating in Billion Oyster Project's shell-collection program.

Oysters at Zadie’s Oyster Room, one of the New York City restaurants participating in Billion Oyster Project’s shell-collection program.

Oysters at Zadie’s Oyster Room, one of the New York City restaurants participating in Billion Oyster Project’s shell-collection program.