Soylent Green is a 1973 American 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.