By Nathan Rott An experiment in nature-inspired design is underway in a South Florida residential canal. Two mangrove planters are being installed on a new seawall to provide habitat for marine wildlife. Nathan Rott/NPR hide caption POMPANO BEACH, Fla. — At the back edge of a backyard, in a dead-end South Florida canal, Arthur Tiedeman is drilling holes into the face of a seawall his marine construction company recently installed. The seawall is a newer design of reinforced concrete encased in vinyl. It's a smooth, hardened ledge at the intersection of land and sea that's designed to protect property and make the coastline more habitable for people. The problem, Tiedeman says, is that it makes the coastline not very habitable to anything else. "It's not a natural shoreline like mangroves and sand," he says.…