Relocation may seem like the obvious answer, but sadly, those who could relocate already have. The ones that remain, depend on the government for their livelihood. Agree with it or not, that is the way it is.
Others cling to the place where their families have been for generations. I have heard the same about the people who live along the Mississippi River. How many times does one have to lose everything before they move? Everyone has a breaking point.
Relocation can be tough for people looking for work in new cities and they may experience discrimination. I am not talking about racial descrimination, but the kind that happens between locals and "new-comers". Especially since work may be hard to come by without the influx of people seeking to move away from hurricanes, tornadoes, earthquakes, famine, and war.
Before Katrina and Rita, I lived on the Texas gulf coast...5 miles from the coast and 25ft. above sea level. Rita was forcasted to hit Galveston Island as a Category 4. This would have meant the end of my home. What the hurricane didn't completely destroy, the 30ft storm surge and flooding from the runoff would have certainly finished us off. Fortunately for us, and unfortunate for folks east of us, we were spared...but this was my breaking point. We moved an hour inland and where now all we have to worry about is wind damage from future storms.
Why didn't we relocate completely? My work is in Houston. Sure I can obtain the same work in Austin, Dallas, or any other major city with commercial office buildings...but the stark reality is that we would have to take the risk of uprooting the family, quit my job, move in with relatives with the hope of landing employment in another city...not always a guarantee. I would rather take my chances with Mother Nature, thank you.