Massachusetts launches coastal defense against climate change

If fairly conservative climate projections hold true for Boston, global warming could raise sea levels enough by the end of the century that Boston Harbor will flood parts of East Boston and the downtown Financial District during a typical winter northeaster. South Boston, Back Bay, and Cambridge could also flood during a category 2 hurricane, according to simulations produced for the Globe in 2007 by a computer modeling consultant.

“A portion of the downtown areas of Plymouth and Duxbury are mapped as being underwater with the sea level rise,’’ said Mark Sylvia, Plymouth town manager who becomes director of the Green Communities Division of the state’s Department of Energy Resources in February. “The stability of our coastline is directly related to the sustainability of our current and future economic, recreational and environmental resources.” Duxbury, Kingston and Plymouth will work together on one project.

Adaptation has been discussed for years in low-lying island nations, Europe and elsewhere around the world. But it was infrequently mentioned in the U.S. in part because the Bush administration was reluctant to acknowledge manmade climate change, let alone plan for it, climate experts says. They say the incoming Obama administration is likely to accelerate adaptation efforts.

Also, individual cities and towns that wanted prepare for climate change were often stymied because it was not entirely clear how much sea level would rise or how many more fierce hurricanes, for example, New England would experience as worldwide temperatures rose.
As a result, there are only a few instances of adaptation in New England: In 1988 Maine adopted a regulation requiring that anyone building on coastal dunes had to ensure that construction could withstand a 3-foot rise in seal level from global warming. And in Massachusetts, Boston’s Deer Island Sewage Treatment Plant, completed in 2001, was built on land two feet higher than originally planned to avoid flooding by climate change.

“In the past, people said we can’t take action now because we are uncertain about the future,’’ said Kirshen. He said experts are getting better at working uncertainty into climate adaption efforts and hopes Massachusetts will remain sensitive to those uncertainties as it moves forward.
The two-year pilot grant program, known as StormSmart Coasts, will help the communities evaluate ways to protect the state’s 1,500 mile shoreline. It will focus on sea level rise and increased flooding events in the community.
“This program gives mayors, zoning boards, and emergency response teams the tools they need to plan for – and recover from – the impact of rising sea levels and severe coastal storms,” said Ian Bowles, state Energy and Environment secretary.