There is $80 billion worth of real estate, home to some 90,000 city residents, on the edge of Boston Harbor, all of which is in danger in the coming decades as sea levels rise due to climate change. So instead of the Big Dig, the city of Boston is considering building the Big Wall, "a vast sea barrier from Hull to Deer Island, forming a protective arc around Boston Harbor," writes David Abel in the Boston Globe. The wall would have openings to allow ships into the harbor, but those openings would have gates that can close before a big storm to protect the seafront from surges. Read Abel's full story at the Boston Globe.

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