Boston Globe: The large waves, storm surge, and flooding that Hurricane Earl will spawn as it strikes Massachusetts tomorrow night comes with an added dollop of trouble; Sea level rise. Very gradual — and in some cases accelerating — rises in sea level off our coast over the last century will boost the height of Earl’s storm surge — expected to be one to four feet — meaning the wall of water will be able to travel that much farther inland and over higher elevations to flood basements, streets, …