Let the rich have the coasts. The savvy elites are already making ready for what's coming. If you are young, you may very well witness the abandonment of many cities on earth, massive dislocations of people(already underway in Central America, Northern Africa, Alaska) will exacerbate the problems and make solutions intractable. Humans have never been around with CO2 levels this high or average global temperatures rising at this rate. The relative habitability and stability of the Holocene has ended.
I am in the process of looking at properties with climate change, sea-level rise, forest fires, water availability, population density, farmability, and many other factors in mind. Mustachianism, to me, is all about acquiring the resources now and deploying them as quickly as possible before the collapse. When I find an interesting property, I go through a rather brutal checklist/research effort to see if it is the correct choice. When considering sea level rise, obviously you don't want to live right on the water if you have kids and grandkids in mind. King tides, storms etc. are increasing in intensity and frequency so even if you are "safe" from sea level rise you may still be affected. Also consider the back-pressure of higher sea levels on major river systems. That water will still flow, and it's got nowhere else to go but the floodplains surrounding the main channel. These areas are also highly populated.
All that being said, current projections using empirical data and climate models make earth basically unlivable for humans somewhere North of 2 degrees C. When industrial society begins to collapse we'll have the aerosol masking effect to finish us off. In other words, nearly half of the actual warming of the earth is masked by aerosols we pump into the atmosphere. Cessation means rapid warming on the order of weeks to months. So, do what you can, but also try to live a good life.
-fixie