Soylent Green is a 1973 dystopian Science fiction movie depicting a future in which global warming and overpopulation lead to depleted resources on Earth. This in turn leads to widespread unemployment and poverty. Real fruit, vegetables, and meat are rare, commodities are expensive, and much of the population survives on processed food rations, including "soylent green" wafers.
The film overlays the Science fiction and police procedural genres as it depicts the efforts of New York City police detective Robert Thorn (Charlton Heston) and elderly police researcher Sol Roth (Edward G. Robinson) to investigate the brutal murder of a wealthy businessman named William R. Simonson (Joseph Cotten). Thorn and Roth uncover clues which suggest that it is more than simply a bungled burglary.
The film, which is loosely based upon the 1966 Science fiction novel Make Room! Make Room!, by Harry Harrison, won the Nebula Award for Best Dramatic Presentation and the Saturn Award for Best Science Fiction Film in 1973. http://en.wikipedia.org/wiki/Soylent_Green