A range of expected climate features can be predicted. For example, the models all point to more extreme precipitation events. The "100 year" floods might happen every ten years. These events also impact waste water treatment plants around the area. Under the higher emissions scenario, most of the maple forests in the Northeast will be gone by the end of the century.
In terms of the IPCC (conservative) 17 inch sea level rise, the 100 year flood plain puts large parts of Boston at risk. The current 100 year flood plain becomes the 2 year flood plain. One event like the 100 year flood under the new sea level would cost Boston 70-90 billion dollars in damage.
All of these changes can be, at least in part, avoided if we reduce carbon emissions in the short term.