A TV show most people don't even know existed forced “Soylent Green” to have a different title than its book source material.
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A Long-Dead TV Show Forced Soylent Green To Change Its Name
"Soylent Green" was based on the 1966 novel "Make Room! Make Room!" by Harry Harrison. Harrison noted that the makers of "Soylent Green" couldn't use his original title — an allusion to overpopulation — for a mindless reason. It seems the studio felt it was too close to the title of the 1953 sitcom almost no one remembers today.