Credit: MGM If you know the 1973 movie Soylent Green at all, it's likely for the arresting last line. "Soylent Green is people," lead actor Charlton Heston bellows as he is carried away on a ...

This promotional short film for "Soylent Green" (1973) begins by showing clips of films that depicted what the future might be like beyond Earth. The narrator then discusses the origin of the idea ...