Humans have been dealing with and adapting to the natural rate of sea level rise for hundreds of years. Most of Florida, most of Manhattan, almost all of Louisiana, and many, many other highly-populated areas were uninhabitable swampland before we learned to master sea level and the slow, natural rise that has gone on for as long as we have been making scientific measurements.
This panic about rapidly rising seas is nonsense. No Pacific islands have "disappeared" due to sea level rise, nor have any Arctic or Alaskan villages -- those that have seen changes are due to subsidence, not rising seas.
If you want to attribute the 160-year record of slow, steady, 2-3mm/year (2-3cm/decade) natural rise in sea levels to some mysterious factor that has been in place since CO2 levels were below 300, let's hear your theory. Otherwise, there is nothing to be alarmed about.