A weaker Gulf Stream, combined with overall global warming, could mean a lot of trouble for the coast of New England, according to this well-documented story from Weather Underground meteorologist Bob Henson.  The New England coast already has been hit hard by storms and surging high water (see the picture of Scituate, Massachusetts, above) in the past few months. Two nor’easters earlier this month produced two of the three highest water levels ever recorded in Boston Harbor, and things could get worse. A basic problem is that the sea level along the Northeast coast is rising faster than it is…