Harry Max Harrison was an American science fiction author, known mostly for his character The Stainless Steel Rat and for his novel Make Room! Make Room! (1966). The latter was the rough basis for the motion picture Soylent Green (1973). Long resident in both Ireland and the United Kingdom, Harrison was involved in the foundation of the Irish Science Fiction Association, and was, with Brian Aldiss, co-president of the Birmingham Science Fiction Group.

Soylent Green is a 1973 American ecological dystopian thriller film directed by Richard Fleischer, and starring Charlton Heston, Leigh Taylor-Young, and Edward G. Robinson in his final film role. It is loosely based on the 1966 science-fiction novel Make Room! Make Room! by Harry Harrison, with a plot that combines elements of science fiction and a police procedural. The story follows a murder investigation in a dystopian future of dying oceans and year-round humidity caused by the greenhouse effect, with the resulting pollution, depleted resources, poverty, and overpopulation. In 1973, it won the Nebula Award for Best Dramatic Presentation and the Saturn Award for Best Science Fiction Film.