Hive City of the Atomic Era

In the last decades of the "Atomic Age" , the Earth temperature had increased because of the pollution and the industry Only the Earth North Pole and South Pole were safe from desertification . As the colonization of the other planets was beginning the deserts were expanding on the Earth surface , and his inhabitants had to leave the wastelands that were expanding from the equator to the tropics to find  shelter and comfort into Hive cities. These Hive cities were built from the normal cities that could be found on the Earth surface but  were added  walls and sandstorms defenses and turned into self sufficient places. The energy to power these cities was provided by nuclear reactors built in the ground deep beneath the cities. The Hive Cities were connected to each other by a dense network of Highways , Railroad and Ships.