Climate Central: Historic carbon emissions have already locked in enough future sea level rise to submerge most of the homes in each of several hundred American towns and cities, according to Climate Central-led research published Monday in Proceedings of the National Academy of Sciences. The animated timeline on this page maps, year by year, how the total number of locked-in cities could climb to more than 1,500, if pollution continues unchecked through the end of the century. It also lays out an alternative timeline...