There is a great abundance of places to live in the world, but, eventually we will have used all of the space up, in a hell of a long time. if we were to look at the uninhabitable areas of the desert in africa, north america and the near east, among other areas, then we would have a lot of great places to live that will yield great wheat crops for us if we were to reverse the desertification of these areas.
The first thing that comes to mind is a desalination plant on the coasts of these areas. huge beaches nobody will ever use converted in places for water collection – maybe we could place these plants along the coast ‘near the rocks’ where people cannot swim anyways? the high temperature is good for growing certain types of crops, and, why not grow them there? they will be close to the coast and will be easy to transport from place to place, of course.