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Soylent Green, released in 1973, was Charlton Heston's final film role. It is a dystopian science fiction movie set in a future where overpopulation and pollution have ravaged the Earth. The film explores themes of resource scarcity, environmental degradation, and social control. Heston portrays a New York City detective investigating the murder of a high-ranking government official and uncovers a shocking secret about the food supply.