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Raising a section of Main Street in Charlestown and inventing a deployable floodwall on the East Boston Greenway are two of the measures outlined in a new report about Boston’s vulnerability to climate change. Issued over the weekend, the “Coastal Resilience Solutions For East Boston and Charlestown” report offers near-term and long-term recommendations for protecting those communities from 3 feet of sea level rise. Researchers expect sea levels to rise 36 inches by 2070, leaving Boston with the likelihood of being flooded every month during the highest tide.Boston Mayor Marty Walsh’s office said they will move forward with two of the near-term recommendations."Climate change is here. It's happening now,” Walsh said. The plans could cost a total of up to $3.1 million.“We are seeing more frequent flooding on our waterfront, especially in East Boston and Charlestown," said Walsh. "It's more important than ever that we work together to make sure our city is ready for the changes ahead."Tidelands were originally filled high enough to protect East Boston and Charleston, which were historically islands and peninsulas, from flooding and high tide. The report, however, said that new preventative measures are needed as sea levels continue to rise.Elevating Main Street in Charlestown is, by far, the more expensive project. The city said the $2 million or $3 million project would block the main pathway for flood waters in all but the most extreme flooding situations, offering protection to over 250 residents and 60 businesses. That work will be combined with a Rutherford Avenue and Sullivan Square redesign project slated to begin in 2021. The full slate of near- and long-term proposals for Charlestown could cost between $33 million and $62 million, but offer more than $201 million in benefits, the report said. The deployable floodwall on the East Boston Greenway would involve a 7-foot wall that could be put out whenever a flood is forecast. According to the report, it would offer protection for 4,300 residents and at least 70 businesses. The estimated cost for design and construction of the wall is $100,000. The report’s full slate of solutions for East Boston could cost up to $200 million, but the authors estimated a benefit of more than $443 million.