climate migration

The recent fires in Canada that resulted in a few days of heavy smoke-related air pollution in the Northeast have momentarily grabbed our attention. The very vocal "enviro-fearful" are concerned with more fires to come; the quieter "enviro-fearless" shrug it off as bad forest management. Each side accuses the other of bias in their interpretation of these events. There's another predictor of the future that has no such prejudice, and they're signaling their alarm by getting out.
With the recent hurricane in Florida, the concern about how and what to build back has returned to center stage. Should we continue to rebuild where time after time it is washed or blown away? And if we relocate how do we compensate the homeowners?
What we can learn from ice cores, is there a climate migration already underway, a healthy behavior that costs little and is oh so restful, and a bit of relevant science history about vaccinations and epidemics.