The World Inside

In the 1960s, professional population alarmist Paul Ehrlich made hilariously inaccurate prognostications of imminent Malthusian doom. While these predictions inspired some SF authors to depict crowded future worlds, Silverberg’s 1971 quasi-utopian tale—less a novel than a collection of closely linked vignettes—presents a 24th-century Earth populated by 75 billion fanatically pro-natalist conformists. The product of centuries of artificial selection and social pressures, rewarded with (or forced to endure) frequent, meaningless sex, the citizens of the three–kilometer–high Urbmons are for the most part incapable of imagining other ways of life. Those few deviants who rebel are either forcibly cured or summarily executed. By modern standards this is a lean book, but Silverberg can bring a world to life with a few carefully chosen words, and a recent HBO option suggests it will appeal to present-day audiences. (Mar.)