SF Themes - Overpopulation

There are many popular themes in science fiction stories and films. One of them is population control. From Soylent Green (Make Room! Make Room!) and Logan’s Run (novel and film) to The Caves Of Steel (novel) and Passengers (film). Many science fiction writers have frightened us with their version of what they believe society will become because of overpopulation and all of them have made us wonder, “what is the answer to overpopulation”. What are your favorite overpopulation novels or movies?
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