Produced at the height of the overpopulation scare, ca. 1970, engendered by the awful propaganda of Paul Ehrlich and his ilk, this movie attempts to take things to their logical conclusion if we really become too scared to reproduce ourselves. Since some are still at it - continuing such scare talk today, including a group which actually calls itself 'ZPG' - it might be worth considering one film's view of where it all leads.
The opening depicts an authoritarian government, apparently global, announcing a decision of how to deal with the crisis of overcrowding, depleted resources, pollution and so forth which were so taken for granted as defining our future that no further explanation was necessary to audiences of 1971. The government decides to reject alternatives such as mass sterilization and "euthanasia" (mass murder), in favor of simply outlawing additional births (for 30 years). Why this was chosen is never discussed, but it sets up the plot and our heroes.
Science fiction enthusiasts won't be impressed with the hardware (government announcements, for instance, are made via flying loudspeaker rather than any kind of broadcast). Homes are equipped with some kind of automatic abortion machine, which cleanly does its job via some sort of invisible rays. At least they don't sugar-coat it, as the button is indeed labeled "abortion."
For a world supposedly suffering overpopulation, the one shown is curiously uncrowded. Couldn't the producer hire enough extras? Where are the crowds?!
One interesting thought the movie puts forth, which never quite occurred to me before, is that in such a world where people are considered a blight, medical cures might actually be unwelcome, as they compound the "problem" by helping keep people alive. This may be the most chilling aspect of such a dystopia.
The protagonists' efforts to evade the legal restrictions - and death penalty - for having a child actually seem plausible at first, but how they might ever continue to conceal the child as it grows is never discussed, and makes the idea seem increasingly foolish. In the end, the couple seeks to escape their society altogether, but how that option suddenly appears without ever having come up before is a big plot hole. How is it that there is anyplace to escape to?
So, no award-winning anything here, but at least this movie had the guts to ask what should be obvious questions, which others avoid to this day even as they continue to preach that people are a blight and that some vague day of reckoning awaits us for having too many babies in the world.