<i>For example, when the global atmospheric CO2 level reaches 930 gigatons, Boston will be due for about 9 feet of sea level rise. That’s enough water to cover 25 percent of the city during high tide.</i><p>I know that is not insignificant, but these fears of sea level rise always sound to me like people expect entire states to go under water or something. This map actually suggests to me that a lot of this can be coped with.<p>But I mostly walk everywhere, so I don&#x27;t have a guilty conscience. I gave up my car years ago.