On the grossly-overpopulated planet, remnants of "nature" exist only in the isolated areas not covered by housing, industry and industrial farming. Creativity and individuality are suppressed and channeled into rigid social formats. A powerful bureaucracy/police state oversees the acts of all citizens. Its purpose is to maintain control for the planetary elite, and to that end it is prepared to resort to any method, however ruthless.
In contrast to all this, the author introduces another planet on which human development has followed a diametrically opposite path: the natural world is respected; population is limited; and each individual is encouraged to develop uniquely. On this other world, human beings are known to be basically "spiritual", and immortal in nature. Telepathy and telekinesis are developed as much and as rapidly as possible.
As the narrative progresses, a confrontation develops between these different systems.