It took less than 100 years for New Yorkers to wipe out the oyster population in the New York Harbor. Now, the Billion Oyster Project is trying to rebuild the oyster population one shell at a time.The Billion Oyster Project, which has worked since 2014 to rebuild oyster reefs in the waters surrounding New York City."When explorers first arrived in New York Harbor, they found a harbor that was full of fish," said Pete Malinowski, Executive Director of Billion Oyster Project. "And the backbone of that ecosystem was the oyster reefs."Why Oysters?Oysters have a remarkable ability to filter nitrogen pollution from water as they eat. A single adult oyster can filter about 50 gallons of water per day. Oyster r...