Any place that have good governance as for now should be a good place to start with. You would want low crime rate, good public service, good hospitals etc. Note that I sat good _public_ *** because money can practically buy all those but I doubt everyone on HN has the money as of year 2050.

If you are anticipating climate change and societal collapse the more reason to go for a strong central government (as well as a strong standing army). There is not a lot of choices out there.